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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Energy Savings With ZoningZoning Saves - A properly designed zoning system can save on average up to $30 on monthly energy bills.


Peak Electricity Usage

There are several studies that confirm the tremendous energy savings that Zone Damper Systems can achieve over single zone systems. Zoning allows you to shut off rooms not being used and prevents rooms that are already comfortable from receiving air that makes rooms Too Hot or Too Cool. With today’s high cost of energy, and it will continue to go higher, when did you see your utility bill go down just because gas at the pump dropped, everyone is looking for ways to reduce their utility bill. Depending where you live, heating and cooling can be as much as 65% of your monthly utility bill. Heating and cooling unused parts of the home or wasting energy heating or over heating some rooms while others are still too cold is no longer affordable. Many experience this condition in their homes and offices every day.

Zoning solves both problems. When you install a zone damper system with a thermostat in every room or zone, you eliminate the problems associated with forced air of rooms that are Too Hot While others are Too Cold. Zoning provides the benefit of Comfort and the value of Energy Savings.

These studies show savings of 15% to 29% for zoning over single thermostat homes. Savings will vary a lot by the use of the system. In fact, zoning can actually cost you more, if one were to keep all thermostats set at the same temperature. However the most effective way to save is setting back the thermostats in the unoccupied zones. The amount of temperature setback and time of the setback are all variables on the savings that will be achieved.

The combination of zoning with automatic setback thermostats will truly enhance your comfort and savings by providing an automatic program for setback for each zone on a daily basis.

Download our Energy Savings Calculator App for the iPhone or iPod Touch Available on the App store.    Search “zonefirst”

ZoneFirst App Calculator