Commercial Kitchen Hood Duct Size

With the calculation sheets below you will be able to design the kitchen hoods according to ashrae and greenheck.

Commercial kitchen hood duct size.

Minimum duct size of 7 recommended duct size of 8 10. Here is a breakdown of the duct size you need based on your range hood s cfm if you have a range hood with a cfm of 0 400 you will need a minimum duct size of 4. Excel sheets for the design of and sizing of kitchen hoods. The hood factor 3 the design process 6 selecting sizing exhaust hoods is the first design guide in a series that will help you achieve optimum performance and energy efficiency in your commercial kitchen ventilation system.

The illustration above shows a typical commercial kitchen application utilizing a roof mount upblast exhaust fan or wall mount upblast exhaust fan in conjunction with a supply fan. Note that not both exhaust fans are required for hood exhaust. Minimum duct size of 6 recommended duct size of 8. With the additional 12 inches may vary by local regulations for the overhang of the hood this comes up to 140 inches or 11 feet 8 inches.

For example if your kitchen is 16 long x 16 wide with an 8 ceiling it would contain 2 048 cubic feet of space. State of the art stainless steel grease duct systems are nfpa 96 compliant designed to safely convey grease laden vapors from commercial kitchen cooking equipment. Commercial kitchen equipment manufacturer. The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows.

If your hood is between 601 and 900 cfm you need a minimum duct size of 7. You should also keep in mind what the future may dictate in terms of additional or larger items. If your hood is between 401 and 600 cfm you need a minimum duct size of 6. 16 wide x 16 long x 8 high 2 048 cubic feet.

View the kitchen exhaust duct sizing chart below to determine your ductwork diameter based on range hood cfm. Read on to determine how to size your exhaust and supply fans. 16 2 please refer to the duct diameter sizing chart by hood size and cfms. A range hood should be able to exchange the air in the kitchen at least 15 times per hour or every four minutes.

A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended. Are you interested in representing captiveaire and selling our products. 14 2 15 6 to 20 0. Rounding up to the nearest foot you would therefore need a 12 foot hood.