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Clean Air Flow Calculator

Indoor Air Quality CFM Calculator

Our Air Quality CFM  Calculator will show you the volume clean air you need. This information will help you choose the right air purifier for your needs. Hundreds of people use our CFM calculator each week to find  answers to indoor air quality questions. We are happy to provide the consumer with this useful tool. Do you know how much air purification you need? Enter your information in the calculator or form below and get the answer in Cubic Feet per Minute from the professionals at LakeAir.

Need More Help?

We hope our CFM Calculator is a useful tool for you. If you are not sure how much air purifier you need for you specific situation, please give us a call at 800-558-9436 and we will help you through the complex task of finding the right product for you. 

CFM Calculator Form

If you would like us to figure out the CFM and air purifiers you need for an area you can submit the form below.

Calculate Clean Air Needed Manually

There is a complex formula used to measure the volume of air needed. The measurement unit is CFM. CFM stands for cubic feet per minute. CFM is the amount of air that passes through a device. In this case the device is an air purifier.

The amount of the air volume is determined by the size of the fan and motor. The amount of resistance caused by the filter also plays a role. The size of the inlet and outlet also come into the equation. A large fan will move more air than a small fan. A dense filter may trap more particles. However it will reduce the volume of air. An air purifier maybe cute and small but not be able to produce enough clean air.

LakeAir has several models each designed for a different size area. The noise levels vary from unit to unit. The filter that allows the most air to pass through while cleaning the most is an electrostatic filter. We recommend this technology most often for low noise, best cleaning efficiency and highest volume of clean air.

Each LakeAir brand cleaner provides a level of air cleaning capacity which is measured in cubic feet per minute (cfm). This is determined by the size of the room and the number of air changes per hour. Follow the steps below to help you determine which model will effectively clean your home or workspace.

Pollutant Concentration
Suggested Air Changes Per Hour
Typical Application
4 – 8
Living rooms, bedrooms and waiting areas
9 – 12
Computer areas and kitchens
13 – 16
Restaurants, bars and banquet halls
illustration to determine CFM


A 15’ X 15’ X 15’ living room

Step 1:  15 x 15 x 15 = 3375 ft3

Step 2:  3375 ft3 / 60 minutes = 56.25 ft3 per minute

Step 3:  56.25 ft3 per minute x 8 air changes per hour ( an average polution level ) = 450 cfm (cubic feet per minute)

Step 4:  A LakeAir LA-Table model would be ideal for this space. The LA-Table is available in electrostatic, media filter and HEPA filter models.

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