Commercial Kitchen Exhaust Fan Sizing

Exhaust fans and equipment can help provide ashrae acceptable indoor air quality in terms of ach air changes per hour.

Commercial kitchen exhaust fan sizing.

The minimum requirements say that this air should be changed 15 times an hour. The manufacturer derives the airflow from parameters set out by national fire code nfc. The information presented is applicable to new construction and in many instances retrofit construction. 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.

This page is designed to be a general guide for selecting an exhaust fan based on the size of the room and the type of application the fan will be used for. The exhaust fan drawing below illustrates how static pressures are measured in ductwork with a manometer. 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. This design guide reviews the fundamentals of kitchen.

Static pressure in fan systems is typically less than 2 sp or 0 072 psi. For applications where the 10 horizontal distance cannot be met separation between exhaust and supply must be at least 3 feet. This means that a fan must have the ability to move 14 400 cubic feet of air in an hour. 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.

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. We are open service tech support parts fast lead times from 6 local plants. 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. 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.

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. You now need to multiply 960 x 15. Roof deck to top of exhaust fan windband 40 min. One pound per square inch is equivalent to 27 7 sp.

Supply fan intake 10 min. A pressure differential between the duct and the. From all exhaust fans.