How To Size Exhaust Fan For Kitchen Hood

If your kitchen is 12 x 15 and 10 high that equals 1 800 cubic feet.

How to size exhaust fan for kitchen hood.

The cubic feet per minute rating is a measure of how much air the fan can exhaust from the kitchen in a minutes time. While an exhaust hood serves this purpose a key question remains. Because ventilation requirements vary from state to state and even from city to city it s important to check with local. 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.

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 duct size is directly proportional to the cfm rating. Note that not both exhaust fans are required for hood exhaust. Here s a helpful example.

Step 3 install the vent hood. Determine the recommended ventilation based on your kitchen s size. 2 x research source this equates to a complete cycling of air every 4 minutes. 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.

The hvi also recommends that your range hood should be capable of cycling the air in your kitchen completely 15 times per hour. Calculate kitchen hood energy. 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. Read on to determine how to size your exhaust and supply fans.

Install the fan the filter and the light kit. Some state building codes do require mechanical ventilation such as an exhaust fan in the kitchen. 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 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.

Connect the vent hood using screws and anchors to ensure a good tight fit. The general size and rule of thumb for mua is a 6 hood or larger or 2000 cfm or more of exhaust flow. 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.