Fire Damper Sizing Calculator
Select and size fire/smoke dampers per NFPA 80 and 90A.
Fire Damper Rating Requirements
| Wall Rating | Fire Damper | Combo Damper |
|---|---|---|
| < 3 hr | 1.5 hr | 1.5 hr |
| ≥ 3 hr | 3 hr | 3 hr |
Select and size fire/smoke dampers per NFPA 80 and 90A.
| Wall Rating | Fire Damper | Combo Damper |
|---|---|---|
| < 3 hr | 1.5 hr | 1.5 hr |
| ≥ 3 hr | 3 hr | 3 hr |