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Portable HEPA Sizing Chart

100 sqft 25 0sqft 500 sqft 750 sqft 1000 sqft 1250 sqft 1500 sqft 1750 sqft 2000 sqft
XR-100 1.5 ACH .6 ACH -- -- -- -- -- -- --
Roomaid 3 ACH 1.2 ACH .6 ACH .4 ACH -- -- -- -- --
2500 13 ACH 5.25 ACH 2.6 ACH 1.75 ACH 1.3 ACH 1 ACH .88 ACH .75 ACH .65 ACH
3000 16.88 ACH 6.75 ACH 3.38 ACH 2.25 ACH 1.69 ACH 1.35 ACH 1.13 ACH .96 ACH .84 ACH

* Calculations based on homes with 8 ft ceilings.
** Formula: ACH = CFM of unit x 60 (minutes in an hour) divided by the area of room divided by the room height

The above sizing chart is a guideline only.

Although there is no exact sizing formula for HEPA filters, you should keep a couple of points in mind.

  • Generally speaking, the more air changes per hour (ACH) you can have, the more effective a HEPA filter can be.
  • There are no guidelines as to how many ACH you should provide, but as a rule of thumb, 1 ACH provides excellent air cleaning results. However, you can also get very good results at .5 ACH depending on your preferences, house, etc. As a matter of fact, a HEPA filter performing at .5 ACH will produce better results than most other air cleaning devices on the market. This is important to know because often budget plays an important role when purchasing a HEPA filter.
  • People with sensitivities (allergies/asthma) may require an ACH of 2 or higher
  • Remember: More HEPA is better than less, but some HEPA is better than nothing at all.
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