CFM Calculator

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How to Calculate CFM (Cubic Feet per Minute) for Air Purifiers: Complete Guide & Calculator

Understanding CFM is essential when choosing an air purifier for your home or business. CFM (Cubic Feet per Minute) measures how much air flows through your air cleaning system each minute. This critical metric determines whether an air purifier can effectively clean the air in your space.

Why CFM Matters for Air Purification
The right CFM rating ensures your air purifier can handle your room's size. A higher CFM means the unit filters more air quickly, making it ideal for larger spaces. Too low a CFM rating means poor air quality; too high wastes energy and money.

Calculate Your Required CFM
Finding your ideal CFM is simple: Room Length x Width x Height = Cubic Feet Cubic Feet x Air Changes Per Hour / 60 = Required CFM

For example

A 20' x 15' room with 8' ceilings needs: 20 x 15 x 8 = 2,400 cubic feet 2,400 x 4 air changes/hour / 60 = 160 CFM

Use our free CFM calculator above to find the perfect air purifier size for your space. Simply input your room dimensions, and we'll calculate the recommended CFM for optimal air cleaning performance.