Air Changes

Air Vs Outdoor Air

Believe it or not, indoor air is dirtier than outside air. According to the Environmental Protection Agency (E.P.A.), “Americans, on average, spend approximately 90 percent of their time indoors, where concentrations of some pollutants are often 2 to 5 times higher than typical outdoor concentrations.” When it comes to preventing airborne contaminants, such as viruses, mold, allergens, etc., from impacting people’s health, it’s important to consider the amount of air changes in a given space.

How Long do Particles Stay in a Room?

Particles and volatile organic compounds (V.O.C.s) are constantly being generated by human activity, furniture, pets, cleaning solutions, people coughing, skin shedding, and many more. The smaller the particle the longer it’s likely to stay in the air. See the following graphic for a reference of particles sizes and how long they take to fall in a given space.

What is an Air Change
and how is it useful?

An air change is the number of times air enters and exits through a given space in an hour and it is normally expressed as air changes per hour or (ACPH or ACH). It is important to change the air in a space as frequently as possible to prevent any airborne contaminants to impact people or product in a room. The E.P.A. recommends a minimum of 5 air changes per hour. In reality most places are well below that. Schools We recommend at least 3.5 air changes for any given space and increase it depending on the activity been conducted in a specific room.

Understanding the right
Air Purifier for your Need

An air purifier is important to help clean the air and increase the number of air changes in a room. An Air Purifier with HEPA technology will capture the particles in the room. Air Purifiers with HEPA filter are recommended by the CDC, and HEPA Filters are used in the cleanest environments in the world that manufacture medication, the chips in our phone and the satellites or robots sent to space and other planets. A common term that identifies an Air Purifier’s ability to increase air flow in a given space is noted as cubic feet per minute or C.F.M. The higher the CFM, the higher the air is changed in a room.

Air Change Calculator

Here’s our own calculator to simulate a given space.

Output Result

Recommended Filtr Units For Your Space

Output Result


    SIgn Up

    I agree with terms & conditions