Wall-Canopy vs. Backshelf Exhaust Hood
Short answer: A wall-canopy hood mounts overhead against a wall and overhangs the whole cook line — the most common, highest-capture choice. A backshelf (proximity) hood sits low and close behind counter equipment for a compact footprint and lower airflow, but it doesn't suit tall or high-effluent appliances. Both must be sized and vented to code.
| Dimension | Wall canopy | Backshelf / proximity |
|---|---|---|
| Mounting | Overhead, against a wall | Low, close behind the equipment |
| Capture | High — overhangs the full line | Good for low-profile equipment only |
| Airflow (CFM) | Higher, sized to the line | Lower; smaller footprint |
| Equipment fit | Fryers, ranges, broilers, ovens | Counter ranges, griddles — not tall/high-grease |
| Best for | Most cook lines | Tight spaces, low equipment, lower ceilings |
Frequently asked questions
Is a backshelf hood Type I or Type II?
Backshelf hoods come in both — a Type I backshelf handles grease from counter ranges/griddles, a Type II handles heat/steam. The equipment underneath dictates the type, just like a canopy.
When can't I use a backshelf hood?
Over tall, high-effluent equipment like fryers or charbroilers, or where the appliance is too tall to sit under a low proximity hood — those need a wall-canopy (or island) hood with the airflow to capture the plume.
Which captures grease better?
A wall-canopy generally captures more because it overhangs the whole line at height; a backshelf trades some capture for a smaller footprint and lower airflow, so it's limited to the right equipment.