Dehumidifier Calculator

Calculate how many dehumidifiers are needed!


PPD Required:


Dehumidifiers Required:

Learn about Dehumidifiers!

Factor Chart

Dehumidifier Type Class 1 Class 2 Class 3 Class 4
Conventional Refrigerant 100 40 30 N/A
Low Grain Refrigerant (LGR) 100 50 40 40
Desiccant (Air Changes per Hour) 1 ACH 2 ACH 3 ACH 3 ACH

ACH = Air Changes Per Hour
CFM = Cubic Feet Per Minute

These results are for informational purposes. We do not guarantee or warranty the accuracy of these results. Based on the IICRC "Initial Dehumidification Recommendation Factors and Formulas" Chart.