Wall Canopy Hood CFM Calculator
Exhaust airflow for a wall-mounted canopy hood.
Enter your values
ⓘ Live results
Results
- Exhaust airflow
- 1,800 CFM
- Rate used
- 300 CFM/ft
- Makeup air (80%)
- 1,440 CFM
- Duct dia at 1800 FPM
- 13.5 in
Quick answer
Wall-mounted canopy hoods are commonly sized at 150-450 CFM per linear foot of hood, lower than an island hood because the wall helps contain the plume.
CFM = hood length x CFM per linear foot (wall rate)
How to use the Wall Canopy Hood CFM Calculator
- 1Measure the hood length across the cooking equipment.
- 2Select the appliance duty category.
- 3Confirm the fan curve delivers this CFM against your actual system static pressure.
Worked example
Using the values the calculator loads with:
Inputs
- Hood length6 ft
- DutyMedium
Results
- Exhaust airflow1,800 CFM
- Rate used300 CFM/ft
- Makeup air (80%)1,440 CFM
- Duct dia at 1800 FPM13.5 in
Frequently asked questions
Residential range hood?
A 30-36 in residential hood over a home range usually only needs 300-450 CFM total.
Overlap requirement?
Hoods should overlap the equipment by 6 in on each open side.
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.