Smoking Room Ventilation Calculator
Exhaust airflow for a designated smoking room.
Enter your values
ⓘ Live results
Results
- Design exhaust
- 563 CFM
- Per-occupant basis
- 480 CFM
- 15 ACH basis
- 563 CFM
- Supply air (90%)
- 506 CFM
- Net negative
- 56 CFM
Quick answer
Smoking rooms are typically exhausted at 60 CFM per occupant and held negative to surrounding spaces.
CFM = 60 x occupants, minimum 15 ACH
How to use the Smoking Room Ventilation Calculator
- 1Enter the room's occupancy and dimensions.
- 2Use whichever basis gives the higher airflow.
- 3Supply about 90% of the exhaust so the room stays negative and smoke cannot migrate.
Worked example
Using the values the calculator loads with:
Inputs
- Occupants8
- Floor area250 sq ft
- Ceiling height9 ft
Results
- Design exhaust563 CFM
- Per-occupant basis480 CFM
- 15 ACH basis563 CFM
- Supply air (90%)506 CFM
- Net negative56 CFM
Frequently asked questions
Can air cleaners replace exhaust?
No — filtration removes particles but not the gases, so exhaust is still required.
Door treatment?
Self-closing doors and a vestibule dramatically reduce leakage.
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.