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

Floor area (sq.ft) 2,000 sq.ft

Ceiling height (m) 3.0 m

Space type (target ACH)

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

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Indicative estimates only — not a binding design. Actual ventilation depends on occupancy, equipment heat, code minimums and duct static pressure.

Need an exact BOQ, rate analysis or measurement sheet?

This is a quick engineering estimate. For tendering, billing or audit, our QS & estimation team prepares an item-wise BOQ, rate analysis and a verified measurement sheet to IS / CPWD norms — backed by 15+ years and ISO 9001:2015 quality processes.

Get a detailed BOQ & rate analysis → WhatsApp our QS team

Ventilation / Fresh Air Calculator