By-Pass Sizing Calculator

Often with zoning systems a By-Pass is needed to relieve excess air when only a small zone or number of small zones cannot deliver the required air flow thru the HVAC System. A by-pass is often ducted back into the return air or into non-critical, common conditioned temperature areas such as entry ways, hallways, basements, etc.

Select your Maximum Total System Cubic Feet per Minute (CFM), then enter the CFM of your Smallest Zone to calculate the type of By-Pass Damper you require.

Note: If the By-Pass CFM amount is 30% or less of the Total System CFM, No By-Pass is required.

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SPRD08

The By-Pass Damper you are looking for is SPRD08.

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SPRD09

The By-Pass Damper you are looking for is SPRD09.

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SPRD10

The By-Pass Damper you are looking for is SPRD10.

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SPRD12

The By-Pass Damper you are looking for is SPRD12.

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SPRD14

The By-Pass Damper you are looking for is SPRD14.

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SPRD16

The By-Pass Damper you are looking for is SPRD16.

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RDM18-SPC

The By-Pass Damper you are looking for is RDM18 w/SPC.

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RDM20-SPC

The By-Pass Damper you are looking for is RDM20 w/SPC.

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ZDSM2020-SPC

The By-Pass Damper you are looking for is ZDSM2020 w/SPC.

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ZDSM2420-SPC

The By-Pass Damper you are looking for is ZDSM2420 w/SPC.

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ZDSM3024-SPC

The By-Pass Damper you are looking for is ZDSM3024 w/SPC.

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VK24xx – Make-Up Air Ventilation Damper System


Description

The ZONEFIRST Make-Up Air Ventilation Damper System is designed to provide outdoor make-up air whenever an exhaust fan or ventilation hood is operating to replace the exhausted air by introducing make-up air into the building.

The system is a kit consisting of three basic components, the RDSC (normally closed) motorized damper, which opens to allow outdoor air into the building, the SPS05 pressure sensor switch to sense when the exhaust fan or hood is operating and a T24 24VAC transformer to power the damper and pressure sensing switch.

When the exhaust fan or hood is on, the pressure sensor switch will sense the increased air pressure and open the RDSC damper. When the exhaust fan or hood is off, the pressure sensor will sense the decrease in air pressure and cut the power to the damper motor. The damper blade will spring closed against the damper’s internal gasket, ensuring a tight seal.

Models available:
Model VK2404 includes 4” Damper
Model VK2405 includes 5” Damper
Model VK2406 includes 6” Damper
Model VK2407 includes 7” Damper
Model VK2408 includes 8” Damper
Model VK2409 includes 9” Damper
Model VK2410 includes 10” Damper
Model VK2412 includes 12” Damper
Larger dampers sizes available to 20” diameter.

VK24xx Operating & Installation Instructions