Commercial Kitchen Hood Exhaust Duct Size

Excel sheets for the design of and sizing of kitchen hoods.

Commercial kitchen hood exhaust duct size.

Please fill out the following form and we will contact you soon. 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. This design guide reviews the fundamentals of kitchen. The length of overlap for overlapping duct joints shall not exceed 2 inches 51 mm.

The information presented is applicable to new construction and in many instances retrofit construction. A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended. Minimum duct size of 6 recommended duct size of 8 601 900 cfm. The general size and rule of thumb for mua is a 6 hood or larger or 2000 cfm or more of exhaust flow.

Read on to determine how to size your exhaust and supply fans. The difference between the inside cross sectional dimensions of overlapping sections of duct shall not exceed 1 4 inch 6 4 mm. Minimum duct size of 4 recommended duct size of 6 401 600 cfm. The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows.

Note that not both exhaust fans are required for hood exhaust. Hvac duct size calculator excel. 16 2 please refer to the duct diameter sizing chart by hood size and cfms. View the kitchen exhaust duct sizing chart below to determine your ductwork diameter based on range hood cfm.

These excel programs are used in sizing exhaust hoods air volume flow and capture velocities free exhaust hood calculator. 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. With the calculation sheets below you will be able to design the kitchen hoods according to ashrae and greenheck. 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.

If your conditioned air whether heated or cooled is getting pulled out of your facilities at a rate of 2000 cfm or greater it will cost you allot more money in the long run than the initial cost of a mua fan. So if you have a 30 wide stove you would need a range hood with a fan that moves at least 250 cfm of air. Minimum duct size of 7 recommended duct size of 8 10.