How To Size Exhaust Fan For Kitchen Hood

Install the fan the filter and the light kit.

How to size exhaust fan for kitchen hood. 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. Because ventilation requirements vary from state to state and even from city to city it s important to check with local. Step 3 install the vent hood. While an exhaust hood serves this purpose a key question remains.

If your kitchen is 12 x 15 and 10 high that equals 1 800 cubic feet. Note that not both exhaust fans are required for hood exhaust. A range hood should exchange the air in the kitchen 15 x per hour. 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 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 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. Calculate kitchen hood energy. Some state building codes do require mechanical ventilation such as an exhaust fan in the kitchen.

Here s a helpful example. 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. Read on to determine how to size your exhaust and supply fans.

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 general size and rule of thumb for mua is a 6 hood or larger or 2000 cfm or more of exhaust flow. The duct size is directly proportional to the cfm rating. Caulk around the seams between the vent hood and the ceiling.

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. 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. 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.