Restaurant Grease Exhaust Fans
The airflows for the following fans were determined using 200 cfm (cubic feet per minute) per linear foot for medium duty cooking, and 300 cfm (cubic feet per minute) per linear foot for heavy duty cooking.
Hood manufacturer's required airflow or any local code airflow requirement should be abided by.
Do I have medium duty cooking or heavy duty cooking?
First off, check to see if there is a U.L. or E.T.L. label on the inside of the hood capture area. If there is, it will normally state the listing information (450° or 600°), and any minimum cfm airflow requirements.
If there is no label, adhere to the following guidelines regarding medium versus heavy duty.
What is Medium Duty?
Medium duty cooking consists of the following equipment: steamers, kettles, ovens, griddles, fryers, and open burner ranges.
What is Heavy Duty?
Heavy duty cooking consists of the following equipment: charbroilers (gas and electric), salamanders, upright broilers, and woks.
If a mixture of equipment is used under one hood, it is recommended to define the cooking load to the next highest load or use separate hoods.