Full walkthrough
v1.2.11
Fresh Air Calculator
Ventilation from the single space all the way up to the air-handling unit. Spaces by the ASHRAE 62.1 Ventilation Rate Procedure; dwellings by ASHRAE 62.2. Dedicated extract fans and toilet/kitchen exhaust are balanced against the supply floor by floor. A building wizard rolls the whole project up per floor and per FAHU.
Pinned to
ASHRAE 62.1-2022ASHRAE 62.2-2025IMC 2021
Last reviewed against the printed text · 24 August 2026
Walkthrough
Early access
Fresh Air Calculator is in the founding-seat offer.
One subscription, the full suite. Download the free preview now — join early access and we'll write when founding seats open.