Heat Recovery Ventilator Calculator
Estimate preliminary HRV airflow from building volume and occupancy, then compare unit capacity, daily energy and operating cost.
Default project preview
107 CFM
ACH airflow
93 CFM
Occupancy airflow
60 CFM
Installed airflow
150 CFM
Building volume
16,000 ft³
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
ACH airflow = building volume × target ACH ÷ 60 for CFM, or × ACH for m³/h. Compare it with occupancy airflow, use the larger value, then add reserve.
FAQ
Heat Recovery Ventilator Calculator questions
Why compare ACH and occupant airflow?+
Volume and occupancy represent different ventilation drivers; the calculator uses the larger entered requirement.
Is rated airflow available after duct losses?+
Actual airflow depends on external static pressure and the unit fan curve, so commissioning and balancing are important.
Does heat-recovery efficiency change airflow sizing?+
Efficiency affects energy recovery, while airflow sizing depends mainly on the ventilation requirement and system resistance.