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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Plug-In-Play™


The Easiest, Fastest Zoning System to Install Could Save You Thousands…
hvac-zone-control-zoning-damper-plug-in-easy

ZONEFIRST’s Plug-In-Play™ zoning system is the easiest, fastest and most cost-effective zoning system to install in the market today.

 

 

Zone Control Panel Features:
MDP3

Model MDP3 – Single-Stage, Multi-Stage All In One Panel – Zone up to 103 zones.

  • Color-coded, push-in wiring terminals – Make for fast and hassle-free wiring for your thermostats and equipment. No screwdriver required.
  • System Status LEDs – Make for easy troubleshooting. Indicates how the board is currently operating.
  • Damper Position LEDs – Shows the position of each zone damper. RED for CLOSED / GREEN for OPEN.
  • Damper Test Buttons – Allows you to test each zone damper from the board.
  • Plug-In Damper Terminals – Makes for easy damper wiring, just snap it in!
  • Compatible with any 4/5 wire thermostat
  • Compatible with any equipment

 

 

 

Zone Damper Features:
RDP

Model RDP – Plug-In Zone Damper Tested to over 1,000,000 Life Cycles

  • 12VDC Motor – Tested to over 1,000,000 life cycles to guarantee long life
  • Power Open / Power Close – 5 second nominal
  • Minimum position setting – easily adjustable
  • Connects to control panel using modular cord – RJ11 phone jacks, just snap it in!
  • Motor comes equipped with dual jacks – allows for daisy chaining zone dampers together.
  • Damper Position LED – Motor shows position of damper. RED for CLOSED GREEN for OPEN.
  • Daisy chain – up to 10 zone dampers per zone.
  • 25′ of cord – included with every damper.