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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BLISS™ – IoZ Internet of Zoning – Wi-Fi App Based Zoning System



Wireless Wi-Fi Zone Control



Introducing BLISS™, the world’s first and only Wireless, Wi-Fi, App Based Combination Light Switch and Thermostat. Bliss solves the problem of rooms that are TOO HOT or TOO COLD because the thermostat’s in the wrong place. Bliss also provide for the ultimate in room-by-room temperature control and the obstacle of running wires for thermostats because wi-fi stats need power and sensors need battery changes. The Bliss app not only controls your temperature but your lights as well and fits in a standard 2×4 junction box with a standard rocker switch plate.

The Bliss System provides real time temperature control and system operation. Thru the wireless communication the damper sensors monitor duct temperature, pressure, humidity and IAQ to the app. The app can also remotely control the lights the old switch used to control, at the switch or remotely via the app.


In addition to the LST for each zone, a WDS is also used for each zone to monitor the damper position, duct temperature, pressure, humidity and later IAQ. The HCM is used to activate the HVAC System and the gateway connects to the home’s network for remote access.