Living Room CFM Calculator
Supply airflow for a living or family room.
Enter your values
ⓘ Live results
Results
- Supply airflow
- 384 CFM
- Fresh air component
- 30 CFM
- Registers at 120 CFM each
- 4
- Trunk duct at 800 FPM
- 9.4 in dia
Quick answer
Living rooms usually need 1-1.5 CFM per square foot, with more airflow for large glazed areas.
CFM = area x rate x glazing factor
How to use the Living Room CFM Calculator
- 1Measure the room and judge how much glass it has.
- 2Split the total across two or more registers for even mixing.
- 3Place supplies near the glazing to wash the cold surfaces.
Worked example
Using the values the calculator loads with:
Inputs
- Room area320 sq ft
- GlazingAverage
- Typical occupants4
Results
- Supply airflow384 CFM
- Fresh air component30 CFM
- Registers at 120 CFM each4
- Trunk duct at 800 FPM9.4 in dia
Frequently asked questions
Why more air near windows?
Glass is the biggest load; blowing air across it stops cold downdrafts in winter.
Open plan?
Treat the whole open area as one zone and total the areas.
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.