All posts by Joe Borges

Where Do Bathroom Fans Vent To

Where Do Bathroom Fans Vent To

Where do bathroom fans vent to? This is one of the burning questions asked by most people with a high interest in bath fans. To begin with, let me admit that bathrooms are damp places that require regular airflow to keep them fresh and free from odors and smells. As you all know, a bathroom is a damp room that mostly stays in a moist, warm, and wet state due to regular bathing. To ensure that mold and dampness are controlled at all times, a bath fan must be installed to maintain the overall freshness and comfort at all times.

Why consider a bath fan?

There are many reasons why homeowners consider installing bath fans over other ventilating units. Apart from the obvious reason of eliminating odors, smells, and steams from the bathroom, these units go further to reduce the concentration of dangerous and hazardous fumes caused by most cleaning agents.

Now, unlike in the past where fans were only limited to ventilating a room, today’s bathroom exhaust fans have gone ahead to incorporate more outstanding features that make them usable in many different ways. For instance, most bathroom fans available in the market provide a more decorative appeal to the room while still providing sufficient lighting to the entire room when bathing.

In addition to that, these bathroom fans are quieter than before, making them perfect for indoor applications. When it comes to the power rating, these fans are designed in a more efficient manner, allowing them to consume less power than their latter counterparts.

Where do bathroom fans vent to?

When installing a bathroom fan, one question you must ask yourself is where the fan will vent to during operation. To achieve an efficient airflow throughout the room, always ensure that the fan vents towards the roof of the house. This is the perfect vent location for each ventilation unit because of the vast air circulation at the top area. However, depending on the design of the bathroom fan, you’ll find that there are different ways through which a technician can install the ventilation unit. Now, in this section, we will highlight the different bath fan options and see how each one of them is installed.

Through the wall

The first bath fan option is the wall-mounted type of fan. This type of fan is usually installed directed towards the wall either in the interior or exterior wall. This type of fan installation is not very common as it’s only applicable to bathrooms with cathedral type ceiling (those without any attic spacing above) or where the ceiling doesn’t have any additional space left due to the large skylights.

In such a situation, you’ll need to vent the exhaust fan through the wall to the outside. Depending on the location of the bath fan, the ductwork may either be short or extensive as you’ll have to pay attention to every detail to avoid any leakage in the future.

Sometimes you may consider the ductwork to go through the exterior wall. In such a case, you only need to vent the fan directly from the bathroom to the outside wall. This technique is simple and doesn’t require you to do much of the ductwork

Through the roof

This ventilation method is mostly usable in ceiling mounted bath fans. These types of fans are the most common in most bathrooms and they involve installing the fans directly on the ceiling of the room. Such fans are suspended in an upside down position allowing them to remove moisture, odors and steam easily through a suction technique. When air is suctioned from the bathroom, it’s pulled through the ductwork (installed in the attic space) to the roof of the house while still allowing fresh air to get through.

For this method to be accomplished, a hole must be cut on the roof of the house for a vent hood to be installed. This method is very critical and must be accomplished by a professional to ensure that the roof doesn’t leak.

Final thoughts

Having highlighted the various methods of installing a bath fan, I believe that you now understand where bathroom fans vent to. Although these methods are all effective when it comes to ventilating your bathroom, professionals prefer the wall mount method over the ceiling option due to the latter’s ability to keep a house free from leakage incase of rain. With that being said, I believe that you’re now fully informed on how bath fans vent and the different methods of installing the ductwork.

Air King BFQ 90 High Performance Bath Fan

Air King BFQ 90 High Performance Bath Fan Review

The Air King BFQ 90 High Performance Bath Fan, 90-CFM is one of the most affordable brands on the market today. But it is not only because of its price that people are buying it, but also because of its effectiveness in keeping their bathroom less humid and odor free. It also has a number of special features and included accessories that make the installation process easy.

You can safely mount it on the ceiling over your tub or shower, making sure that it is on a GFCI circuit. But what really sets this apart from a regular bathroom fan is its latest technology incorporated in the powerful motor. This allows up to 90-115 CMF of airflow capacity and only 2.5 sones of noise.

All of the parts are also guaranteed durable. The housing is made of high-impact plastic that also helps in reducing the noise that the fan produces. Meanwhile, the white grill is made of polymeric to complement most decors. Moreover, the box also includes the 4-inch plastic duct collar, backdraft damper, wire nuts, and a Romex connector.

UL, Culus, HVI 2100, and R-40 have certified this product as safe, long lasting, and effective to use in the house. It has also passed the standards and specifications of ASHRAE 62.2 for local exhaust. Lastly, it is backed by a 1-year warranty.

Features of Air King BFQ 90 High Performance Bath Fan

  • A ceiling-mounted type of bathroom or exhaust fan
  • Runs with a powerful motor that allows 90-115 CMF airflow capacity
  • UL-Listed, Culus-listed, and Home Ventilation Institute certified
  • Requires GFCI branch circuit wiring
  • Produces noise at 2.5 sones while in operation
  • Features the Snap-In Installation System that makes mounting and assembly easy for users
  • Includes a 10 x 10 inches of white/cream polymeric grille and plastic housing that help reduce noise
  • What is in the box: 4-inch duct collar, backdraft damper, mounting bracket, wire nuts, Romex connector, and user manual
  • Passed the standards and specification of ASHRAE 62.2 and R-40
  • Comes complete with a 1-year manufacturer warranty on parts


Keeping your bathroom well ventilated does not have to be tedious and expensive for you can always buy a bathroom fan like the Air King BFQ 90 High Performance Bath Fan. This product is one of the best brands on the market that is offered at a budget-friendly price. Determine if this would be the right bathroom fan you are looking as you read its features and benefits below.

When purchasing a bathroom fan, you want something that is really effective in making your shower room a healthier place for the whole family. The higher the airflow capacity, the more efficient the bathroom fan is in reducing the humidity and preventing mildew buildup. This product is rated 90-115 CFM, which is high enough to be at par with the leading brands today. It produces only 2.5 sones of noise.

The materials and engineering of the whole unit also help in reducing the sound it produces. For example, the grille and the housing are made of polymeric and high-impact plastic. These materials are both durable and not prone to breakage, unlike bent or welded steel, which makes a rattling sound. Moreover, they are also rust- and water-resistant, prolonging the product life of your bathroom fan. Indeed, this is ideal in areas with humid environments or high moisture levels.

Another good thing about this bathroom fan is its snap-in installation feature. Using screws, you can assemble the casing, fan, and all the other parts within an hour all by yourself. According to the reviews, it is by far the easiest bathroom fan to assemble and install without the need of a professional.

But of course, the easy installation feature would not be good if you do not have everything that you need to assemble and install the unit. That is why the manufacturer included all the mounting brackets, wire nuts, and even a Romex connector in the box. In other words, you do not have to buy anything separately.


There are a lot of great features that this low-budget deserves to boast. However, it is not yet perfect. The areas to improve are in design and performance. One of the things that you will notice about this unit is that the slots of the grille are big. While the big slots help in the exhaust of air better and faster, the housing is more visible from below. Aside from this, the noise it produces is not whisper-silent; you will still hear the sound when the unit is on but not to the point that it is disturbing.


Highlighting the snap-in installation system and the powerful motor, the Air King BFQ 90 High Performance Bath Fan, 90-CFM is no doubt a great buy. It is a reliable bathroom fan that is also affordable. Therefore, this brand deserves to be considered as one of the best today. Get your own unit to experience its benefits for yourself.

Here’s a Video – about the Air King BFQ 90 Fan & Features

BV Ultra-Quiet 90 CFM 07 Sone Bathroom Ventilation and Exhaust Fan

BV Ultra-Quiet 90 CFM, 0.7 Sone Bathroom Ventilation and Exhaust Fan Review

Ventilation or exhaust fans are an important addition to every bathroom because they keep the environment dry and lessen the risk of health problems. If you haven’t installed one in your bathroom, consider buying the BV Ultra-Quiet 90 CFM, 0.7 Sone Bathroom Ventilation and Exhaust Fan.

As the name suggests, this product boasts its quiet operation, producing a sound that is only 0.7 sones. Compared to standard bathroom fans, this one is extremely quiet. Aside from this, the product is also known for its ability to effectively eliminate odor and reduce air humidity with its 90 CFM airflow rate. The combination of silent clever technology, as well as a powerful motor, made all these qualities possible.

Overall, the unit has a solid and durable build. The housing is made of stainless steel that is durable and rust-resistant. Meanwhile, the motor promises consistent performance during long hours of operation because it is permanently lubricated and thermally protected.

Aside from this, it is also certified by HVI 2100, CSA, as well as ETL approved; in other words, it is sure to have high-quality materials and is also safe to be installed on the ceiling. What more is that it is also certified by ENERGY STAR, which means that this bathroom fan won’t consume much energy.

All this is offered at an affordable price including the accessories and the 1-year manufacturer’s warranty.

Features of BV Ultra-Quiet 90 CFM, 0.7 Sone Bathroom Ventilation

  • A ceiling-mounted bathroom fan that runs powerfully and quietly at 120V and 60 Hz
  • Runs with a permanently lubricated and thermally protected motor that operates quietly within 0.7 sones
  • Airflow capacity is within 90 CFM, great at eliminating bathroom odor and reducing humidity
  • Features the super-quiet ventilation system with silent clever technology
  • Includes 3 support braces, grille, adaptor, wiring compartment, secure tabs, housing, and installation hardware instructions
  • Includes a 4-inch stainless duct collar
  • Approved by HVI-2100, CSA, and ETL on quality and excellent performance
  • Certified by ENERGY STAR for energy savings, meeting the standards of US EPA
  • Comes a 1-year limited warranty and technical support service


When buying a bathroom fan, you want something that is not only effective in keeping your bathroom free of odor and reduces the humidity, but also works quietly. However, the great and silent bathroom fans are usually expensive. Fortunately, the market has the BV Ultra-Quiet 90 CFM ceiling-mounted bathroom fan. This brand is one of the best models on the market because it has been created by BV, a trusted name that set a new standard for bathroom fans. They are unique in terms of design and technology used for achieving the super-quiet operation. Decide whether this unit is exactly what you want as you read more of its features and benefits below.

This unit has a powerful 120V motor that has a lifetime lubrication. This means that you do not have to disassemble the unit and lubricate the motor so that it will properly function. Also, this means that the motor lasts longer than those motors without permanent lubrication. Aside from this, the motor is also thermally protected, ensuring consistent and continuous operation in all seasons. This bathroom fan is also certified by HVI 2100, CSA, and ETL for its quality and safety. Instead of plastic materials, the housing is made of stainless steel, which is rust-resistant and durable.

The product name would not be ultra-quiet if it were not indeed silently operating. BV has incorporated the clever silent technology in the heavy-duty motor. While the motor allows 90 CFM airflow, it will produce a nearly silent noise at 0.7 sones. This is better than other bathroom fans that claim to be quiet while turned on. Meanwhile, the airflow capacity will not only reduce humidity but also prevent glass from getting foggy.

What attracts buyers most to this product is its inexpensive price. It may not be the cheapest option today, but it is definitely good to know that buying a whisper-type bathroom fan is not hard on the pocket. And because it has met the standards of ENERGY STAR, your electric bill won’t be affected by using this bathroom fan. Affordable and energy efficient, this product is truly a cost-effective and a great investment.


One of the things to take note of is that the unit is shipped not fully assembled. All the parts you need are in the box, including the adaptor and wiring compartment, support braces, and secure tabs. While there is an instruction manual, the assembly could be difficult, not to mention mounting it on the ceiling. So, it’s advisable to ask for professional help to ensure safety. Lastly, the manufacturer warranty is only limited to 1 year.


Nevertheless, the BV Ultra-Quiet 90 CFM, 0.7 Sone Bathroom Ventilation and Exhaust Fan is a great choice. Seeing all its great features, you are sure to get the most out of your purchase. Installation is difficult and the warranty is limited, but you can always ask for help through their technical support.

Broan 678 Ventilation Fan and Light Combination

Broan 678 Ventilation Fan and Light Combination Review

Why settle for an ordinary bathroom fan when you can have an amazing product that not only ventilates but also brighten your restroom? The Broan 678 Ventilation Fan and Light Combination is indeed a powerful unit that will keep your bathroom dry and also bright. It runs at 50 CFM while operating quietly at 2.5 sones.

In other words, it is good at preventing moisture and mold problems with less noise, which is a common problem with powerful motors. Meanwhile, the plug-in motor is permanently lubricated and promises to perform well consistently every day. This also thanks to the other components such as the polymeric fan impeller.

As proof, this product is UL-listed and HVI certified, which also means that it is safe to install and use in your home. Moreover, this bathroom fan also has a two-function control once it is connected to a GFCI-protected circuit for added convenience.

The bathroom fan can use a light bulb up to 100-watts, as per your choice. Once you add the bulb to the built-in and shatter-resistant lens, the bulb will be able to shed even distribution of light in your bathroom. The installation process of the whole unit is so easy due to the key-holed mounting brackets, polymeric duct connectors, and backdraft damper.

Now, do not think you can only use this for your bathrooms, because of its simple white color, this unit will complement any room.

Features of Broan 678 Ventilation Fan and Light Combination

  • A ceiling mounted fan and light for bathroom or room ventilation and lighting
  • Runs with powerful plug-in motor that is permanently lubricated; performs consistently and won’t wear easily
  • UL listed and Home Ventilation Institute certified
  • Runs within 50 CFM and operates quietly within 2.5 sones
  • Features key-holed mounting brackets, polymeric duct connectors, and backdraft damper for easy and accurate installation
  • Made of durable galvanized steel material
  • Includes a light diffusion lens that is shatter-resistant
  • Accepts up to 100-watt of light bulb (not included in the purchase)
  • Includes a 10 x 11 inches white grille that is made of polymeric grille, complementing any room decor
  • Product dimensions: 8 x 8.25 x 4.24 inches
  • Rated 1.6 Amps
  • Comes complete with a 1-year limited manufacturer’s warranty


The Broan 678 Ventilation Fan and Light Combination one of those less-expensive bathroom fans on the market today. However, it is not only because of the price that people choose this bathroom fan over others, but because of its reliable performance. In fact, Broan has been a leading maker of ventilation fans in North America since 1932. So, when it comes to reliability, its manufacturer is no doubt trustworthy.

Aside from affordability, this bathroom fan also boasts of its functionality. It is more than a ventilation fan that will improve the air and odor of your restroom because it also has a light to add brightness. This combination is what makes the whole unit look more desirable compared to those standalone bathroom fans offered in the same price range.

When buying a bathroom fan, one important factor to check is the overall build or construction. Looking at the quality of materials and how the parts are put together, you will be convinced that it is professionally manufactured. For example, the plug-in motor is already permanently lubricated to ensure consistent operation. This also spells convenience because you no longer have to add lubrication to keep the motor running well. Meanwhile, the body is made of galvanized steel, which is a convincingly durable material. The light diffuser lens is shatter resistant as well.

As mentioned above, this is not only a ventilation fan for bathrooms but for any room. Its design is simple, with a classic grille that complements any decor. And since it is mounted on the ceiling, it won’t really matter where you install it. If you have allergy or asthma, you will surely benefit with this ventilation fan.

Speaking of installation, don’t forget that this factor also matters when choosing the right bathroom fan. Fortunately, the product features mounting brackets, polymeric duct connectors, and backdraft damper that will be easy for you to install the entire unit.

Of course, safety is also paramount in bathroom fans, especially with lights. This unit takes a bulb up to 100 watts and will safely operate as approved by the HIV and UL standards.


Most of the advantages of this product are also its disadvantages. The light cover may dim the light of the bulb. Aside from this, another drawback is that that the bulb is not yet included in the purchase. So maybe you can just choose a very bright bulb that will not be affected by the cover. Lastly, take note that this unit may produce a rattling noise while in operation.


Overall, the Broan 678 Ventilation Fan and Light Combination is a great choice. It is might not be as silent or as powerful as the leading brands, but it sure has the capabilities to keep your bathroom odor and moisture free. Therefore, it is recommendable.

Delta Breez SLM70 Slim 70 CFM Exhaust Fan

Delta Breez SLM70 Slim 70 CFM Exhaust Fan Review

Investing in a bathroom fan is cheaper than fixing a bathroom full of mold and mildew, not to mention that such task is also tiring and time consuming. If you have been wanting to keep your restroom properly ventilated, then install the Delta Breez SLM70 Slim 70 CFM Exhaust Fan.

This product is one of the most affordable units on the market today and is also known for its performance. It has the power of a DC brushless motor that allows air flow speed of 70 CFM. This means that your restroom will be kept dry and odor free at all times. Meanwhile, the motor is also operating quietly at 2 sones, thanks to the spring-mounted grille that reduces the noise. There is a LED indicator that shows you it is quietly running.

The product not only produces low noise, but also consumes low energy. In fact, it is also certified by ENERGY STAR as an energy-saving bathroom fan. Thus, it is indeed cost-effective. Moreover, this product is also approved by UL, ensuring that it is safe to be mounted on the ceiling or wall.

These certifications prove that the unit is well-built and has a long product life. You will notice that the steel cover is galvanized to resist corrosion.

Features of Delta Breez SLM70 Slim 70 CFM Exhaust Fan

  • A ceiling or wall-mounted type of bathroom ventilation fan
  • Weighs only 5 lbs. and is easy to install
  • Runs with powerful DC brushless motor that ensures continuous operations
  • UL listed and ENERGY STAR certified for safety and energy-saving operations
  • Runs within 70 CFM and operates quietly within 2 sones
  • Cover is made of durable galvanized steel material
  • Includes a white grille that is made of polymeric materials, complementing any room decor
  • Grille is spring mounted to reduce noise
  • Features a LED indicator that turns green when the unit is running
  • Includes a 3-inch standard duct
  • Power rating: 120V/60 Hz
  • Power consumption: 11.5 – 13.1 watts
  • Comes complete with a 3-year limited manufacturer’s warranty on defects


Delta Breez is one of the trusted manufacturers of high-quality, yet inexpensive ventilation fans. So, if you are looking for a reliable brand that offers bathroom fans at an affordable price, this is definitely a name to consider. The manufacturer creates bathroom fans of all sizes and different specifications. One of their best small fan units is none other than the Delta Breez SLM70 Slim 70 CFM Exhaust Fan.

Buying this 5-lb. bathroom fan is a great bargain. While it is cheap and small, it is made of quality materials and machinery. By the looks of it, you will be convinced that it is professionally built and that it will last longer. Instead of using a metal body, the manufacturer chose a galvanized steel housing that resists corrosion or rust due to exposure to a humid environment. Aside from this, the brushless DC motor has also proven to be reliable at all times, ensuring consumers of its consistency and durability.

It is not only because of the brushless motor that the bathroom fan is able to run quietly. The spring-mounted grille also has something to this because it reduces the rattling noise while the unit is on. Thus, the product remains true to its promise that the low noise is only 2 sones. Now, to make sure that it is turned on, there is an LED indicator under the grille.

Another quality that buyers like about this bathroom fan is its flexibility or versatility. You can either install it as a ceiling fan or wall fan because the mountings allow both types of installation. Either way, the performance is still the same. In other words, it can still remove humid air and allow up to 70 CMF of airflow. In fact, you can also install it in whichever room you want because of its simple design. It won’t stand out much in the room but complement any decor.

Like the leading brands, this one is also ENERGY STAR certified and UL-listed. Both certifications approve that the unit has passed their strict safety and quality standards. Also, the ENERGY STAR certification ensures low energy consumption, low utility bills, and a low environmental impact. As with other ventilation fans under the same brand name, this also comes with a 3-year warranty on defects.


Compared to some leading brands that operate only at 0.3 sones, this unit is not extremely quiet. This is a common problem with bathroom or exhaust fans that have powerful motors with a 120v/60Hz rating. Aside from this, you should watch out for the defect on the LED indicator because some buyers noticed theirs are not working while the unit is on.


Overall, theDelta Breez SLM70 Slim 70 CFM Exhaust Fan is a great product to select. It is cheap and effective in driving away bathroom odor and keeping it dry. Though it is somehow noisier than other leading brands, it is quiet enough not to cause a disturbance.

Panasonic FV-11VQ5 WhisperCeiling 110 CFM Ceiling Mounted Fan

Panasonic FV-11VQ5 WhisperCeiling 110 CFM Ceiling Mounted Fan Review

The right bathroom fan is not only powerful at driving away odor but also quiet during operation. The thing is that bathroom fans are not always like this. Fortunately, you can choose the Panasonic FV-11VQ5 WhisperCeiling 110 CFM Ceiling Mounted Fan, White.

This product has 120 volts of power rating at 60 Hz, which means that it really has the power to maintain the airflow in the bathroom. Meanwhile, it also features a double-tapered blower that operates with less noise. This will run only around 110 CFM and won’t exceed 0.3 sones.

Aside from this, the product also boasts of its plain housing that has a double hanger bar system. It even has an adapter so you can install it in the way you want. Just like other units from the same brand, this one is also UL listed for the shower enclosure as well as ENERGY STAR certified.

With this, rest assured that you are safe while using the bathroom fan. Not only is the fan efficient and energy saving, it also promises a long product life, too. Since the manufacturer uses less energy, a thermal-cutoff fuse, and improved blade design, the whole unit is expected to run longer. The product does not come with additional accessories but does have a generous 3-year limited factory warranty on parts.

Features of Panasonic FV-11VQ5 WhisperCeiling 110 CFM Ceiling Mounted Fan

  • A ceiling mounted bathroom fan that runs powerfully and quietly at 120V and 60 Hz
  • Runs with an AC type motor/blower that is UL listed and Home Ventilation Institute certified
  • Has GFCI branch circuit wiring
  • Runs within 110 CFM and operates quietly within 0.3 sones
  • Flexible installation with an integrated 4-inch and 6-inch duct adapter and expandable double hanger bar (up to 24 in.)
  • Features an improved blade design and high performing motor
  • Features thermal cutoff fuse to avoid overheat of motor
  • Includes a 13-inch grille that is already attached to the housing
  • Certified by ENERGY STAR for energy savings, meeting the standards of US EPA
  • Approved by ASHRAE 62.2, LEED, California Title 24, and Washington VIAQ
  • Comes complete with a 3-year limited warranty on parts


If you are looking to buy a new bathroom fan, the best one you will find on the market is the Panasonic FV-11VQ5 WhisperCeiling. This model has received a lot of good reviews from both customers and experts, not only because of its manufacturer’s name, but because of its promising performance. And that is not something to be surprised about because when it comes to technology products, this manufacturer is no doubt one of the leading brands.

As you may have noticed with many bathroom fans, those with great motors are often noisy while those that operate silently, do not help in eliminating humid air at all. According to reviews, this is not a problem with this model. Many are amazed by the AC motor/blower power with a rating of 120V and 60 Hz. Aside from this, it can also move at 110 CFM. Meanwhile, the sound you will hear at 0.3 sones. It will operate this way continuously until you turn it off. How is it possible? Apart from the powerful motor, the manufacturer also uses an improved design of the fan blade; therefore, this makes the performance better than most bathroom fans on the market.

Apart from these qualities, durability is also an important factor to consider. Fortunately, this bathroom fan is well-built and solid in form. You will notice that with the quality of the grille attached to the housing. Furthermore, you will also notice the extra features like the double hanger bar system, allowing you to position the bathroom fan on the ceiling with no trouble.

When it comes to reliability, this brand can be trusted. In fact, when you buy this bathroom fan, the parts are also covered by a 3-year limited warranty. ENERGY STAR, as well as other organizations like LEED, have also certified this product for complying with their strict standards. This means that the fan will also be safe to use and won’t cost too much electricity.


The brand name itself shows how good this bathroom fan is because of the reputation they have established. However, it does not mean that the product does not have a single flaw. One of the reasons why many might not prefer this is the expensive price tag. If you are looking for a cheap bathroom fan, this is not the brand to choose. And it does not include accessories or extras. Aside from this, other reviews also think that this is somehow difficult to install despite the presence of the double hanger bar.


Nevertheless, the Panasonic FV-11VQ5 WhisperCeiling 110 CFM Ceiling Mounted Fan is an unbeatable ceiling mounted bathroom fan. It can run powerfully and quietly every day without adding much to your electricity bill. It will surely keep your bathroom dry and odor free in the best way possible. Therefore, it is a great investment for your home, offering enough value for its expensive price.

How bathroom fans work

How Bathroom Fans Work

If you are wondering what are those fans are doing in your bathroom, then you have found the right page. It’s time for you to know how bathroom fans work and appreciate their important function in keeping your bathroom well ventilated and your health risk-free.

What are bathroom fans for?

Going back to your first question, bathroom fans aren’t installed to keep you cool while showering or doing your other businesses. It is intended to remove the moisture and humidity that cause foul odors or mold buildup. Because your shower area is a damp place, it is prone to be a breeding ground for bacteria. So, the best way to maintain the air quality and cleanliness of your bathroom is to install ventilation systems like a bathroom or exhaust fan.

Today’s bathroom fans are more than just fans or rotor blades. Now, they are electrically powered with AC or DC motors that ensure consistent operation day in and out. Aside from this, they are quieter and efficient in exhausting humidity and improving airflow. Most manufacturers also make bathroom fans aesthetically pleasing, complementing wall decorations. Some even include a light bulb to add brightness to the room.

Aside from bathrooms, this type of exhaust fan also contributes in maintaining the air quality of the entire house. If all restrooms in your house have bathroom fans, the humid air or smell can be expelled outside the house in no time. Of course, the effectivity depends on how powerful they are.

In summary, here are the purposes of bathroom fans:

  • To remove moisture and humidity
  • To eliminate smelly bathroom odors and air pollutants
  • To prevent water vapor that accumulates on the walls and mirror
  • To improve the overall air quality of the bathroom and home

How bathroom fans work

The simplest way to explain the operation is to know the role of each part. Every bathroom fan has a motor, a fan, and a vent; these are essential parts that need to be present in a unit to guarantee successful ventilation. The motor needs an electric supply to power the fan. As the rotor blades spin, moisture is drawn up and is exhausted through the vent hood. This will continue as long as the bathroom fan is plugged in or turned on.

The effectivity of the fan depends on the power, which is rated in cubic feet per minute or CFM. This is the measurement of the airflow capacity of how much the fan can draw moisture from the room in a specified period of time. Thus, it means that the higher the CFM rating, the more air is exhausted and the faster the airflow is. So, if you have a big room, you should get a bathroom fan with high CFM rating.


As a general guideline, one CFM is equivalent to one square foot of the room. For a 100-square-foot bathroom, you should get a 100 CFM exhaust fan. For bathrooms with a standard toilet, bathtub, and shower, an additional 50 CFM is needed to ensure proper ventilation since these fixtures are always damp or wet. For this reason, purchasing a bathroom fan with the right size and specifications is crucial. If the power rating is too low for the size of the room, moisture and odor won’t be effectively eliminated.


The old-style exhaust fans in the bathrooms are noisy, yet they are not properly doing their jobs. Today, you will find that electrically powered fans are more effective. However, the thing about powerful motors is that they are still noisy. And if they are not noisy, it means that they are not exhausting air at all. That’s why manufacturers integrate such kinds of technology to minimize the sound the motor produce. The noise of a bathroom fan is measured in sones. A good one has an average rating of 1.5 to 2.5 sones. Anything that goes beyond that will be disturbing to the ears.

Installation options

This type of appliance comes in different shape and sizes. They can be mounted on the ceiling, walls, or installed inline. All have their own pros and cons in terms of aesthetic design and performance. Aside from this, some bathroom fans can either have a simple switch for turning on and off, or a timer, exhausting moisture after you take a shower.

What size bathroom fan do i need

What Size Bathroom Fan Do I Need

Nothing beats a refreshing shower in a clean and spa-like bathroom. But do you know the secret of keeping your bathroom free from foul odors and bacteria? Yes, that’s the white grille mounted on the ceiling or wall, which is commonly called a bathroom fan. This electrically powered appliance is an important addition to every bathroom because it is designed to improve airflow and reduce excess humidity. Overall, it helps in making your bathroom a safe place for your family by preventing the accumulation of bacteria or mildew.

You might be asking yourself, “What size bathroom fan do I need?” Fret not. If you are looking to replace your broken bathroom fan and do not know how to find the right one, this article is for you. Here, you will find out how you will know the right size of bathroom fan to choose as well as the other important buying factors to consider.

What Size Bathroom Fan Do I Need?

The most common question that people ask when buying a new unit is what size bathroom fan do I need? That is because bathroom fans come in different shapes and sizes, so choosing has become somehow confusing. Aside from this, it is paramount for you to get the right size of bathroom fan to ensure that your restroom will be well ventilated.

Bathroom fan sizes are based on its airflow capacity that is measured in CFM or cubic feet per minute. The general rule of sizing according to Home Ventilating Institute (HIV) is 1 square foot equals to 1 CFM. For example, your bathroom is 100 square feet, the right bathroom fan for you should, therefore, has 100 CFM. However, you should also take note that having toilet, shower, and other fixtures in the bathroom mean more wet area. So, HIV also recommends adding 50 CFMs for every fixture, especially in public and communal bathrooms.


Bath fans are mostly seen installed in the ceiling, but you can also find models that are mounted on the wall. Whichever design you prefer, you should remember that the vent part of the fan should exhaust the moisture out of your home. If you have an attic above the bathroom ceiling, then it might not be ideal to mount the bath fan on that part. Another thing to take note is the size of the duct adapter that will be connected to your house’s ductwork. Some models are easy to install by merely following the user manual. However, other models may need professional assistance that can perform complicated wiring procedures.

Added features

Today, manufacturers have added a variety of features to extend the functionality of the bath fans. Aside from fans, they also have light bulbs for extra brightness in the room. This can also replace the fixtures in the bathroom and save energy when needed. Others might integrate night lights and built-in heaters. The most advanced models have sensors that monitor the humidity and motion, turning on the fan when the room reaches a certain humidity level or when there is an action. It will then turn off when the humidity lessens.

Noise level

The loudness of the sound that the bathroom fan produces is measured in sones. If you like taking a rest while enjoying a steamy hot bath, then you would also want a bath fan that operates quietly, lest your peace will be disturbed. 1 sone is equivalent to a quiet sound of the refrigerator while 2 sones are obviously louder and more noticeable than that. There are models that are below 1 sone, producing whisper-silent noise. However, they are more expensive on the market. Bathroom fans producing sounds at 2 sones are ideal and more affordable. But no matter how cheap 5-sone fans are, do not choose them.


Bathroom fans have become more energy efficient today than they were before. The truth is, they are now 70% lower in consuming energy. The performance is still powerful but the consumption is less. It really won’t affect your utility bill when you add a bath fan, so it’s clearly a cost-effective option. What’s more is that bath fans are greener, too. They produce less or no harmful fumes that can potentially harm the environment. To ensure that your unit is cost-efficient, make sure that it is Energy Star certified.