ACH/ACPH Calculator

Air Changes Per Hour (ACH)

Formula: ACH = (Total Supply Air Flow × 60) / Room Volume

Select Space Type: Office (4-6 ACH) Conference Room (6-8 ACH) Classroom (6-20 ACH) Hospital Room (6-12 ACH) Operating Room (15-20 ACH) Warehouse (6-30 ACH) Kitchen (7-8 ACH) Bathroom (6-7 ACH) Laboratory (8-12 ACH) Welding Shop (12-15 ACH) Select Unit: Imperial (ft, CFM) Metric (m, CMH) Room Length (ft): Room Width (ft): Room Height (ft): Total Supply Air Flow (CFM): Calculate ACH