ERV/HRV Sizing Calculator
Size whole-house balanced ventilation by ASHRAE 62.2, choose ERV or HRV by climate, and lay out duct size, local exhaust, and defrost recommendations.
Default sizing example
- ASHRAE 62.2 ventilation rate: 75 CFM
- Recommended system in zone 5A: ERV
- Recommended duct: 6 in round
- Local exhaust: 100 CFM kitchen, 50 CFM each bathroom