Condensate Drain Calculator
Size condensate drain lines and calculate moisture removal rates for AC and dehumidification systems.
Drain Sizing Table
| Capacity | Drain Size | GPH Max |
|---|---|---|
| Up to 20 tons | 3/4" | 5 |
| 21-40 tons | 1" | 10 |
| 41-90 tons | 1-1/4" | 20 |
| 91-125 tons | 1-1/2" | 30 |
| 126-250 tons | 2" | 60 |
Installation Guidelines
Slope: 1/8" per foot minimum for gravity drain
P-Trap: Required for negative pressure units
Vent: Required for long runs or multiple connections
Cleanout: Install every 50 ft on horizontal runs