Solve For
ACH
—
air changes/hr
Minutes per Change
—
min / change
Code Requirement
—
—
ACH Reference — Selected Space Types (IMC / ASHRAE 62.1)
| Space Type | Min ACH | Source |
|---|---|---|
| Office | 4–6 | ASHRAE 62.1 |
| Conference Room | 6–10 | ASHRAE 62.1 |
| Classroom | 6–8 | ASHRAE 62.1 |
| Exam Room (Medical) | 6 min | ASHRAE 170 |
| Patient Room | 6 min (2 OA) | ASHRAE 170 |
| Operating Room | 20 min (4 OA) | ASHRAE 170 |
| Laboratory | 6–10 (fume) | ASHRAE 62.1 |
| Commercial Kitchen | 15–60 | IMC Table 403.3 |
| Restroom (public) | 2 CFM/SF or 50 CFM/fixture | IMC 403.3 |
| Parking Garage | 0.75 CFM/SF | IMC 404 |