Kitchen Exhaust Fan Size Chart

A 601 to 900 cfm fan requires a 7 inch minimum but an 8 to 10 inch duct is recommended.

Kitchen exhaust fan size chart.

A pressure differential between the duct and the. Commercial and industrial ventilation can be expensive to install or update and finding the right type and size of fan will keep companies and industries in compliance with codes and regulations and make working conditions safe for employees. A ventilation fan should meet at least the minimum size. When replacing or installing a range hood take note of the size shape and mounting type before going to the store the new hood should be at least as wide as the range or cooktop and preferably 3 inches longer on each side.

This fan calculator is typically used to calculate the cfm or cubic feet per minute of air exchange that may be desired in a building. A ventilation fan should meet at least the minimum size. Fan static pressure is measured in inches of water gauge. A 401 to 600 cfm fan requires a 6 inch minimum duct size with an 8 inch duct recommended.

Fundamentals of kitchen exhaust hot air rises. Whether exhausting air or bringing fresh air into a structure the calculation produced should help to figure out the size of fan s required to accomplish the air exchanges needed. Tim carter sizing an exhaust fan tips. Static pressure in fan systems is typically less than 2 sp or 0 072 psi.

The exhaust fan drawing below illustrates how static pressures are measured in ductwork with a manometer. 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. Finding high quality low maintenance exhaust and air movement equipment can save money for agencies and business owners. One pound per square inch is equivalent to 27 7 sp.

To find the fan needed for your size kitchen multiply the number of cubic feet in the room by the number of air exchanges 15 then divide by the number of minutes in an hour 60. That computes to 960 cubic feet of air in the room. Ask the builder. Sizing an exhaust fan kitchen ventilation text.

The minimum requirements say that this air should be changed 15 times an hour. Say the kitchen measures 10 feet by 12 feet with an eight foot ceiling. This means that a fan must have the ability to move 14 400 cubic feet of air in an hour. Use this table to calculate the cubic feet per minute cfm capacity needed for an exhaust fan in a specific room.