Warehouse Ventilation CFM Calculator
Air changes and fan count for a warehouse.
Enter your values
ⓘ Live results
Results
- Required airflow
- 48,000 CFM
- Building volume
- 480,000 cu ft
- Fans at 20,000 CFM
- 3
- Intake louvre area
- 96 sq ft
- Per sq ft rate
- 2.4 CFM/sq ft
Quick answer
Warehouses are typically ventilated at 4-10 air changes per hour depending on process heat and occupancy.
CFM = volume x ACH / 60
How to use the Warehouse Ventilation CFM Calculator
- 1Measure the building envelope and average height to the underside of the roof.
- 2Pick air changes: 4 for storage, 6-8 for light assembly, 10+ for hot processes.
- 3Size intake louvres generously or the fans will stall against their own suction.
Worked example
Using the values the calculator loads with:
Inputs
- Length200 ft
- Width100 ft
- Average height24 ft
- Air changes6 ACH
Results
- Required airflow48,000 CFM
- Building volume480,000 cu ft
- Fans at 20,000 CFM3
- Intake louvre area96 sq ft
- Per sq ft rate2.4 CFM/sq ft
Frequently asked questions
Roof fans or wall fans?
Roof exhaust with low wall intakes uses natural buoyancy and works best for heat.
Destratification fans?
They do not ventilate but can cut heating bills 20-30% in tall spaces.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.