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Calculate Air Exchange (CFM)
Use the calculator to determine the Air Exchange (CFM) required to adequately ventilate an area.Enter information into the fields below in order to calculate the CFM (per fan).
To calculate the CFM required to adequately ventilate an area, we divide the room volume by the appropriate "Minutes per Change" value.
[CFM] = [Room Volume] / [Min./Chg.]
Airflow (CFM) per Fan
*
Starred items represent required fields.
Calculate Static Pressure (SP)
Use the calculator to determine the amount of static pressure the fan must overcome.The pressure generated by fans in ductwork is typically very small. An accurate measurement of static presure is critical to proper fan selection however. Static pressure in fan systems is typically less than 2" SP, or 0.072 Psi.
The amount of static pressure that the fan must overcome depends on the air velocity in the ductwork, the number of duct turns (and other resistive elements), and the duct length. For properly designed systems with sufficient make-up air, the guidelines in the table below can be used for estimating static pressure.
Static pressure
* Starred items represent required fields.
Static Pressure Guidelines
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.
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Spun Aluminum Gravity Ventilator with Flashing Flange, Size 10, Model GRSF-10
$175.30
For natural gravity or positive pressure systems, model GRSF offers excellent performance and durability for intake or relief applications. Featuring an exceptional low silhouette design and rugged construction this model is both efficient and economical.
- All aluminum exterior for corrosion-resistant construction
- Integral birdscreen to prevent entry of birds and small objects
- Built-in flashing flange with prepunched mounting holes for quick and easy installations without a roof curb
Spun Aluminum Gravity Ventilator with Flashing Flange, Size 12, Model GRSF-12
$184.56
For natural gravity or positive pressure systems, model GRSF offers excellent performance and durability for intake or relief applications. Featuring an exceptional low silhouette design and rugged construction this model is both efficient and economical.
- All aluminum exterior for corrosion-resistant construction
- Integral birdscreen to prevent entry of birds and small objects
- Built-in flashing flange with prepunched mounting holes for quick and easy installations without a roof curb
Spun Aluminum Gravity Ventilator with Flashing Flange, Size 8, Model GRSF-8
$158.20
For natural gravity or positive pressure systems, model GRSF offers excellent performance and durability for intake or relief applications. Featuring an exceptional low silhouette design and rugged construction this model is both efficient and economical.
- All aluminum exterior for corrosion-resistant construction
- Integral birdscreen to prevent entry of birds and small objects
- Built-in flashing flange with prepunched mounting holes for quick and easy installations without a roof curb
Shop Greenheck GRSF
Model GRSF is an aluminum ventilator designed to be used as an intake or relief unit on natural gravity or negative pressure systems. The GRS has a flashing flange for roof attachment.
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Our performance filter tool can help you choose the right product based on your performance requirements.
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Applications/uses for a particular fan or ventilator.
Refers to the location where a fan or ventilator can be mounted.
Square base dimension on power roof ventilators. Square fan panel dimension on sidewall propeller fans.
The "ACTUAL" damper width and height. Dampers are undersized to allow them to be mounted into the duct work/wall opening.
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Version 1.0, April 2019
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