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How to Choose the Right Exhaust Fan for Your Home



Exhaust fans are an essential part of any home in India. They help to remove excess moisture, odors, and pollutants from the air, making your home a healthier and more comfortable place to live. However, when it comes to choosing the right exhaust fan for your home, size matters. In this article, we’ll discuss how to measure exhaust fan size at home in India, so you can make an informed decision when purchasing one.

Why Is Fan Sizing Important?

Before we dive into how to measure exhaust fan size, let’s first understand why it’s important. Choosing the right size exhaust fan for your home is crucial for its effectiveness and efficiency. If the fan is too small, it won’t be able to properly ventilate the space, leaving you with poor air quality. On the other hand, if the fan is too large, it will consume more energy than necessary, resulting in higher electricity bills.

Measure the Room Size

The first step in measuring exhaust fan size is to determine the size of the room where the fan will be installed. To do this, you’ll need to measure the length, width, and height of the room in feet. Multiply these three numbers together to get the total cubic feet of the room.

For example, if your room is 10 feet long, 8 feet wide, and 9 feet high, the total cubic feet would be 720 (10 x 8 x 9 = 720).

Calculate the Required Airflow

Exhaust fan in bathroom

The next step is to calculate the required airflow for the room. This is measured in cubic feet per minute (CFM) and is based on the size of the room and its intended use. Here are some general guidelines for CFM requirements:

  • Bathroom: 1 CFM per square foot of floor space
  • Kitchen: 1 CFM per square foot of floor space
  • Living room: 1 CFM per square foot of floor space
  • Bedroom: 1 CFM per square foot of floor space
  • Laundry room: 1 CFM per square foot of floor space

Using our previous example of a 720 cubic feet room, the required airflow would be 720 CFM for a bathroom, kitchen, living room, bedroom, or laundry room.

Consider the Duct Length and Number of Bends

The duct length and number of bends also play a role in determining the size of the exhaust fan. The longer the duct, the more powerful the fan needs to be to push the air through. Additionally, each bend in the duct adds resistance, which also requires a more powerful fan.

For every 10 feet of duct length, add 10 CFM to the required airflow. For every bend in the duct, add 5 CFM to the required airflow.

Calculate the Total Required CFM

To calculate the total required CFM for your exhaust fan, add the required airflow for the room to the additional CFM needed for the duct length and bends. For example, if your bathroom requires 720 CFM and has a 20-foot duct with two bends, the total required CFM would be 740 (720 + 20 + 10 = 740).

How To Measure Exhaust Fan Size

Now that you know the required CFM for your exhaust fan, it’s time to measure the fan itself. Here’s how to do it:

Measure the Fan’s Width and Length

Exhaust fan size measurement

Using a measuring tape, measure the width and length of the fan’s housing. This is the part of the fan that attaches to the ceiling or wall. Make sure to measure from the outer edges of the housing, not the fan blades.

Calculate the Fan’s Area

To calculate the fan’s area, multiply the width and length measurements. For example, if the fan’s housing is 12 inches wide and 10 inches long, the area would be 120 square inches (12 x 10 = 120).

Convert to Square Feet

To convert the fan’s area to square feet, divide the total square inches by 144. In our example, the fan’s area in square feet would be 0.83 (120 / 144 = 0.83).

Calculate the Fan’s CFM

To calculate the fan’s CFM, multiply the fan’s area in square feet by the required CFM for the room. In our example, if the required CFM for the bathroom is 720, the fan’s CFM would be 598 (0.83 x 720 = 598).

Choosing the Right Exhaust Fan

Now that you know how to measure exhaust fan size, you can choose the right one for your home. Here are some additional factors to consider:

Noise Level

Exhaust fans can be noisy, especially if they are too powerful for the room. Look for fans with a low sone rating, which indicates a quieter operation.

Energy Efficiency

Choose an exhaust fan with an Energy Star rating to ensure it is energy efficient and will save you money on your electricity bills.

Additional Features

Some exhaust fans come with additional features such as built-in lights, heaters, or humidity sensors. Consider these features based on your specific needs.


Exhaust fans are an essential part of any home in India, and choosing the right size is crucial for their effectiveness and efficiency. By following the steps outlined in this article, you can easily measure exhaust fan size and choose the right one for your home. Remember to consider factors such as noise level, energy efficiency, and additional features when making your decision. With the right exhaust fan, you can ensure a healthier and more comfortable living space for you and your family.

For more information, visit: Tech Crowd Media

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