Commercial Kitchen Exhaust Fan Sizing

Sizing an upblast or exhaust fan the hood manufacturer dictates the volume of airflow cubic feet per minute or cfm for their hoods depending on the equipment under the hood and whether the hood is against a wall or in the middle of the room island hood.

Commercial kitchen exhaust fan sizing.

One pound per square inch is equivalent to 27 7 sp. For applications where the 10 horizontal distance cannot be met separation between exhaust and supply must be at least 3 feet. The information presented is applicable to new construction and in many instances retrofit construction. A pressure differential between the duct and the.

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. Selecting sizing exhaust hoods is the first design guide in a series that will help you achieve optimum performance and energy efficiency in your commercial kitchen ventilation system. This design guide reviews the fundamentals of kitchen. We are open service tech support parts fast lead times from 6 local plants.

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. This means that a fan must have the ability to move 14 400 cubic feet of air in an hour. According to ashrae standards a rate of 35 or 3 cfm cubic feet per minute per each 100 square feet in a space is an adequate rate of airflow. Fan static pressure is measured in inches of water gauge.

Supply fan intake 10 min. 2 048 cubic foot room x 15 air exchanges 30 720 cubic feet moved per hour. Roof deck to top of exhaust fan windband 40 min. The manufacturer derives the airflow from parameters set out by national fire code nfc.

The minimum requirements say that this air should be changed 15 times an hour. Exhaust fans and equipment can help provide ashrae acceptable indoor air quality in terms of ach air changes per hour. Static pressure in fan systems is typically less than 2 sp or 0 072 psi. All you need to do is select the application from the dropdown enter the size of the room and we will provide you with a general capacity range m3 hr that you should be looking to achieve from the extraction fan.

Roof deck to top of curb 18 min. You now need to multiply 960 x 15. 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.