Building Exhaust Fan Sizing

Use this table to calculate the cubic feet per minute cfm capacity needed for an exhaust fan in a specific room.

Building exhaust fan sizing.

Fan cfm needed this is the optimal exhaust fan cfm cubic feet per minute rating for your greenhouse. A fan this size will exchange the air in your greenhouse at least once per minute which is recommended for venting small greenhouses. Sizing and finding high quality low maintenance exhaust and air movement equipment can save money for agencies and business owners. For example a 30 96 greenhouse with two 36 1 2 hp fans will equal 10 308 2 20 616 cfm s of air movement.

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. Undesired air out fresh air in. Before you install bathroom kitchen or garage exhaust fans start here to determine what you need to proceed for. 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.

Large building ventilation addresses temperature air quality and exhaust noise from compressor buildings rolling mills foundries and warehouses. 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. Evaporative cooler cfm calculator. It removes hot moist air and it can remove odors.

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. The key variables that do change depending on applications are the fan model and the air volume flow rate cfm. Peak height of greenhouse. W x l x h x 0 85.

Although the ventilation process is required for many different applications the airflow fundamentals never change. Bathroom exhaust fans or vent fans are required by the nec national electrical code and local building codes for any bathroom that doesn t have a window that can be opened to provide ventilation and in some jurisdictions they are required even if windows are present a vent fan does two important things. Ventilating a building simply replaces stale or foul air with clean fresh air. Therefore you can use two 51 shutters or you can use two 45 shutters and one 30 gable shutter.

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. Divide by 600 and it will equal 34 36 square feet of opening required.