Multi-basement Air-Change Calculator
Size EMVEE fresh air, exhaust, and jet fans instantly. Add unlimited basements, mix units, and see results for 6 ACH supply and 12 ACH exhaust. Perfect for quick proposals—verify with our engineering team before issue.
Calculator settings
Manual mode — click Calculate
Basements
Tip: Toggle instant mode for live calculations while you type.
Basement
1 m² = 10.764 ft²
1 m = 3.28084 ft
Results overview
Basement ventilation summary
Live totals across every basement you’ve added. Numbers refresh instantly whenever you recalculate.
Totals are expressed in both metric and imperial units for ease of reporting.
Airflow requirements
Supply airflow target to dilute contaminants.
Extraction airflow target for smoke clearance.
Floor area that requires jet fan coverage.
Basement breakdown
Compare airflow demand and fan selections for each basement. Totals are recalculated automatically.
Recommended fans
Optimised EMVEE selections for fresh air, exhaust, and jet fans based on the calculated loads.
Design benchmarks
- Fresh air dilution: 6 ACH baseline for enclosed car parks
- Smoke extraction: 12 ACH baseline for purging (check authority requirements)
- Jet fans: confirm coverage via manufacturer data & CFD
Always validate with local fire strategy and safety codes.
Need engineered sizing?
We provide CFD, jet fan layouts, and full fan schedules tailored to your project.