Wall Canopy Hood CFM Calculator
Exhaust airflow for a wall-mounted canopy hood.
Enter your values
Enter the hood length in ft.
Choose one of: Light (residential), Medium, Heavy (charbroiler).
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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)
At a glance
| What it does | Exhaust airflow for a wall-mounted canopy hood. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Hood length, Duty |
| Main output | Exhaust airflow |
| Formula | CFM = hood length x CFM per linear foot (wall rate) |
| Cost | Free — no sign-up, no download |
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.
Inputs explained
- Hood length(ft)
- Enter the hood length in ft.
- Duty
- Choose one of: Light (residential), Medium, Heavy (charbroiler).
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.
What do I need to enter into the Wall Canopy Hood CFM Calculator?
Just 2 values: hood length, duty. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Wall Canopy Hood CFM Calculator work out the 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. It applies the formula CFM = hood length x CFM per linear foot (wall rate) and shows the working so you can check each step by hand.
Is the Wall Canopy Hood CFM Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.