Exhaust Fan Size Chart: How to Choose the Right Size for Your Room

Choosing an exhaust fan is not the difficult part; the difficult part is getting the wrong size. You might like a style or design, but it's of no use to you if it doesn't fit the dimensions of your room or window. If you want to buy an exhaust fan, you need to refer to an exhaust fan size chart.

You can scroll down and find the exhaust fan CFM (Cubic Feet per Meter) chart below, or stick around and understand exactly how you should be picking your exhaust fan size.

Why is Exhaust Fan Size Important?

Getting the wrong exhaust fan dimensions might throw off your entire room’s ventilation. Plus, if you have limited space in your window, then getting the wrong size will add to your troubles.

The right exhaust fan measurements will ensure that your fan is effective in maintaining proper ventilation in your kitchen or bathroom. Your room will have proper air quality, no moisture buildup, and help you keep your house airy and lively.

How to Choose the Right Exhaust Fan Dimensions?

Just having an exhaust fan CFM chart in front of you isn’t enough. You must know exactly what your home needs. Here are the steps you should take to choose the right exhaust fan size:

Step 1: Measure your Room

Finding the exhaust fan size chart is only one step in the process. You will also need to know the dimensions of the room you want to install the fan in. So start by first measuring your bathroom, kitchen, or the room you want to install the exhaust fan in.

Step 2: Calculate CFM

CFM refers to Cubic Feet per Minute, and calculating it will give you a better idea of what size exhaust fan you should buy. To calculate the CFM, use this formula:

CFM = (Room Volume × Air Changes per Hour) ÷ 60

Add your room’s dimensions and the number of air changes into the formula, and you will have calculated your ideal CFM.

As a rule of thumb:

• General living areas and well-ventilated rooms: 3-8 ACH

• Bathrooms: 8-12 ACH

• Kitchen: 15+ ACH

Step 3: Refer to an Exhaust Fan CFM Chart

Once you know your CFM, you can easily refer to the exhaust fan size chart and find out which size of exhaust fan is perfect for you.

Exhaust Fan Size Chart

At GM Modular, you get to explore a wide range of exhaust fan dimensions and styles. Refer to this chart to find the perfect fit for your living space.

For the best ventilation and air quality, you must get your exhaust fan measurements right. Refer to the exhaust fan CFM chart above and choose the right size of fan for your room. We at GM Modular offer two main styles of high-speed exhaust fans.

Our Eco-Air model comes in four different air sweep variations: 150mm, 200mm, 250mm, and 450mm. Depending on your CFM and room requirements, you can pick one of these options. It is suitable for installing in walls as well as glass windows. The rust-proof body ensures long durability.

Option two is the Xenix model that comes in two variations: 225mm and 300mm. This exhaust fan has a strong metal body and a protective front. This is especially great for rooms that are located at a height, and the protective front design prevents foreign objects and birds from entering the fan.

To understand how much energy your exhaust fan uses and how it impacts electricity bills, also read our detailed blog on Exhaust Fan Power Consumption

Things to Consider when Buying an Exhaust Fan

Before you make your decision, here are some things you might want to take into consideration:

• Airflow Requirement: CFM is not exactly airflow, but it can give you a good idea of the airflow your room would need. But for humid rooms or highly active kitchens, you might want to choose an exhaust fan that offers more airflow than usual.

• Energy Consumption: Opt for an energy-efficient exhaust fan so that you are not only being responsible towards the environment but also saving on electricity bills. Our EcoAir 150mm model only uses 32 Watts and offers a strong 431 air delivery.

• Sweep Size: The diameter of the fan’s blades determines the sweep size of your exhaust fan. While larger sweeps move more air, they also require more space in your walls. So if your room is smaller, opt for a smaller sweep exhaust fan size.

After selecting the right fan, you can easily install it yourself with the help of our guide on Exhaust Fan Installation: A Step-by-Step Guide for Beginners

Frequently Asked Questions

Q. How to calculate the exhaust fan size for a room?

Calculate your room's size and CFM using the formula shown in the article above, and compare those with the specifications of the exhaust fans as given in the CFM chart. But just as a thumb rule, remember that the bigger your room, the bigger and more powerful a fan you would require.

Q. What size exhaust fan do I need for a 12x12 room?

If we are assuming that your CFM is around 144 CFM for a 12X12 room, then according to the bathroom exhaust fan size chart, you would need a fan that offers 200-250 air sweep.

Q. What is CFM in an exhaust fan?

CFM refers to the Cubic Feet per Minute. You can calculate it using the CFM formula, i.e., CFM = (Room Volume × Air Changes per Hour) ÷ 60.

Q. What is ACH?

ACH refers to Air Change per Hour, which is the measure that tells you how many times the entire air in a room needs to be changed in an hour. For more humid and moisture-filled rooms, the ACH will be higher, while for more open and well-ventilated rooms, the ACH requirement will be lower.