How To Size Exhaust Fan For Kitchen Hood

Caulk around the seams between the vent hood and the ceiling.

How to size exhaust fan for kitchen hood.

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. The cubic feet per minute rating is a measure of how much air the fan can exhaust from the kitchen in a minutes time. The fans in range hoods are rated by the cubic feet of air they move per minute cfm and it s important to buy a range hood that moves enough air to be effective. Read on to determine how to size your exhaust and supply fans.

Install the fan the filter and the light kit. Calculate kitchen hood energy. Determine the recommended ventilation based on your kitchen s size. The hvi also recommends that your range hood should be capable of cycling the air in your kitchen completely 15 times per hour.

The general size and rule of thumb for mua is a 6 hood or larger or 2000 cfm or more of exhaust flow. In a kitchen an exhaust fan may remove much of the heat produced by cooking appliances but mix in smoke volatile organic compounds grease and vapor from the cooking process and it becomes necessary to remove these products to avoid health and fire risk. Note that not both exhaust fans are required for hood exhaust. Some state building codes do require mechanical ventilation such as an exhaust fan in the kitchen.

2 x research source this equates to a complete cycling of air every 4 minutes. Connect the vent hood using screws and anchors to ensure a good tight fit. To find the size of fan needed multiply the cubic feet x the of air exchanges 15 then divide by 60 minutes in an hour. Step 3 install the vent hood.

Because ventilation requirements vary from state to state and even from city to city it s important to check with local. A range hood should exchange the air in the kitchen 15 x per hour. You can work out how much air a kitchen hood can extract per hour with a little simple math and the fan s cfm is a measurement of fan power and stands for cubic feet per minute for example an exhaust hood fan with a1 000 cfm can remove all of the air from an area that is 10ft x 10ft x 10ft in one minute. If your kitchen is 12 x 15 and 10 high that equals 1 800 cubic feet.

Kitchen range hoods that are vented to the outside are a great way to remove heat odors moisture and smoke from your home when cooking. Moreover code watcher advises that since 2009 the international residential code irc includes a section on air replacement for houses with active kitchen ventilation. The duct size is directly proportional to the cfm rating.