Free Tool · HVAC
Ventilation / Fresh Air Calculator
Estimate the exhaust / fresh-air airflow your space needs from the recommended air changes per hour (ACH). Adjust the inputs, then get an engineered ventilation design from our team.
Your space
Airflow = room volume × ACH. ACH values follow common Indian practice / NBC for each space type; final fan selection considers ducting, static pressure and code minimums.
Exhaust airflow—
Airflow (CFM)—
Required ACH—
Room volume—
Suggested fans—
Make-up air—
Get an engineered ventilation design — free
Our mechanical engineers will size the fans, ducting and make-up air for your space to code. We'll attach the estimate above automatically.
or reach us directly
✅
Your request is in
Thanks! Our HVAC team will send your tailored ventilation design within one business day.
Indicative estimates only — not a binding design. Actual ventilation depends on occupancy, equipment heat, code minimums and duct static pressure.