Kitchen Exhaust Hood Fan Sizing

Selecting sizing exhaust hoods is the first design guide in a series that will help you achieve. Y distance between table and exhaust hood m c circumference of the hood m 1 can be modified to calculate air volume 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.

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But for this post we re focusing on how to calculate your kitchen range hood fan size.

Kitchen exhaust hood fan sizing. Proximity hood effective design ineffective design building and or health codes typically provide basic construction and materials requirements for exhaust hoods as well as prescriptive exhaust rates. Read on to determine how to size your exhaust and supply fans. A commercial restaurant kitchen grease exhaust type 1 vent hood is essentially comprised of three main components. Fundamentals of kitchen exhaust design guide 1 selecting and sizing exhaust hoods 03 15 04 4 figure 2.

This equates to a complete cycling of air every 4 minutes. One thing you should know before reading on is that range hood power is measured in cubic feet per minute cfm. The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows. 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. Use this formula to also determine the size of heat hoods. Sizing an upblast or exhaust fan. A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended.

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. What size cfm remote kitchen exhaust fan should i use to properly vent a 4 burner gas cooktop. When using smooth round 8 diameter metal pipe add one cfm per foot of pipe plus 25 cfm for each elbow and 40 cfm for a roof cap. The distance from the exhaust above the stove to fan on the outside wall is 14 feet and there are 3 x 90 degree bends to get to the outer wall to vent.

1 the shell of the hood 2 the baffled grease filters and 3 the trough at the bottom of the filters. After all there are several factors to consider such as the size mount style and ventilation type. Note that not both exhaust fans are required for hood exhaust. Q 2 v 1 y 2 c 1a example kitchen exhaust hood.

The size shape length turns and cap on the range hood ductwork adds resistance which reduces the amount of air the vent fan can move requiring additional cfm for the fan. Required air volume flow for a exhaust hood with circumference 3 m located 1 2 m above a stove can be calculated as.