Convert common HVAC engineering units.
Fresh-Air Calculator
Use a current ventilation reference to confirm the governing method, then combine verified outdoor-air rates per person and per floor area into a quick zone airflow requirement where that arithmetic is applicable.
Free calculator — authorized account required
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Scope and standards use
The reference selector helps identify the current governing family and method; it is not a substitute for the purchased standard, local code or authority requirement. Occupancy-rate tables are intentionally not reproduced. Verify the applicable edition, occupancy classification, rate values and any zone/system effectiveness or healthcare/residential provisions before using the result for design.