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To calculate the CFM required to adequately ventilate an area, we divide the room volume by the appropriate "Minutes per Change" value.
Airflow (CFM) per Fan
Starred items represent required fields.
Non-Ducted 0.05" to 0.20"
Ducted 0.20" to 0.40" per 100 feet of duct (assuming duct air velocity falls within 1,000 to 1,800 feet per minute)
Fittings 0.08" per fitting (elbow, register, grill, damper, louver, duct turn, etc.)
Kitchen Hood Exhaust 0.625" to 1.50"
Important: Static pressure requirements are significantly affected by the amount of make-up air supplied to an area. Insufficient make-up air will increase static pressure and reduce the amount of air that will be exhausted. Remember, for each cubic foot of air exhausted, one cubic foot of air must be supplied.
Greenheck has been manufacturing fans for the HVAC and construction industry since the 1950s. We are a global leader in the Air Movement and Ventilation industries. While we lead the industry in quality and price, where Greenheck really excels is our representative support, resources, and warranty.
Choose Greenheck Fans for all your commercial, institutional, and industrial building needs. If you need help choosing a Greenheck fan for your project we strongly recommend using our CFM Calculator to find out how much air movement you really require.
Our commitment to low lead times is demonstrated through our robust manufacturing and fulfillment network, featuring manufacturing plants in our home state of Wisconsin, along with California, Kentucky, North Carolina, and Oklahoma. Our national distribution center is fully stocked and always ready to meet your needs.
We build and distribute fans that can ventilate via Roof or Wall Mounting, and Exhaust Fans for commercial kitchens and residential bathrooms. This combined with our selection of inline ventilators and HVLS products make Greenheck’s catalog one of the most robust and reliable in the world.
Our performance filter tool can help you choose the right product based on your performance requirements.