Commercial Kitchen Exhaust Fan Sizing

Supply fan intake 10 min.

Commercial kitchen exhaust fan sizing. Roof deck to top of curb 18 min. This design guide reviews the fundamentals of kitchen. 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. This means that a fan must have the ability to move 14 400 cubic feet of air in an hour.

Static pressure in fan systems is typically less than 2 sp or 0 072 psi. The minimum requirements say that this air should be changed 15 times 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. For applications where the 10 horizontal distance cannot be met separation between exhaust and supply must be at least 3 feet.

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. A pressure differential between the duct and the. 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. Roof deck to top of exhaust fan windband 40 min.

You now need to multiply 960 x 15. 2 048 cubic foot room x 15 air exchanges 30 720 cubic feet moved per hour. 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. 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.

We are open service tech support parts fast lead times from 6 local plants. Exhaust fans and equipment can help provide ashrae acceptable indoor air quality in terms of ach air changes per hour. The information presented is applicable to new construction and in many instances retrofit construction. One pound per square inch is equivalent to 27 7 sp.

The manufacturer derives the airflow from parameters set out by national fire code nfc. The exhaust fan drawing below illustrates how static pressures are measured in ductwork with a manometer. Fan static pressure is measured in inches of water gauge.