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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Installation Guides & Troubleshooting Documentation


Need help installing or troubleshooting one of our products?

Take a look at our list below, find the product in question, and check out the guide.

Zone Dampers

OZD – Outlet Zone Damper with Wiring Included

Outlet Zone Damper (pdf)


RDM – Automatic Round 24 V Power Open-Closed and Modulating By-Pass Zone Damper

RDM Installation & Operating Instructions


RDP – Automatic Round Plug-In Zone Damper

RDP Installation & Operating Instructions


RDS – Round Automatic 24VAC Spring Return Zone Damper

RDS Installation & Operating Instructions


RRM – Retro-Round Motorized Insertable Damper

RRM Installation & Operating Instructions


RRP – Retro-Round Insertable Plug-In Damper

RRP Installation & Operating Instructions


RTB – Round Take-Off By-Pass Damper

 


RTM – Round Take-Off 24V Power Open Closed and Modulating By-Pass Zone Damper

RTM Installation & Operating Instructions


RTP – Round Take-Off Plug-In Zone Damper

RTP Installation & Operating Instructions


RTS – Round Take-Off 24VAC Spring Return Zone Damper

RTS Installation & Operating Instructions


SPRD – Static Pressure Regulating Damper

SPRD Installation & Operating Instructions


ZDB – Rectangular and Square Bottom Mount Return Zone Damper

ZDB Installation & Operating Instructions


ZDBM – Rectangular and Square Bottom Mount Damper

ZDBM Installation & Operating Instructions


ZDBP – Rectangular and Square Bottom Mount Plug-In Zone Damper

ZDBP Installation & Operating Instructions


ZDS – Rectangular and Square Side Mount Return Zone Damper

ZDS Installation & Operating Instructions


ZDSM – Rectangular and Square Side Mount Damper

ZDSM Installation & Operating Instructions


ZDSP – Rectangular and Square Side Mount Plug-In Zone Damper

ZDSP Installation & Operating Instructions

Zone Control Panels

H32 – Heat Pump, Dual Fuel & Conventional Zone Control Panel

H32 Installation & Operating Instructions


H32P – Heat Pump, Dual Fuel & Conventional Zone Control Panel

H32P Installation & Operating Instructions


MDP3 – Universal Zone Control Panel

MDP3 Installation & Operating Instructions


MDPA – Adder Panel

MDPA Installation & Operating Instructions


MMP2 – Single Stage Zone Control Panel

MMP2 Installation & Operating Instructions


MMP3 – Single Stage Zone Control Panel

MMP3 Installation & Operating Instructions


MMZ3 – Single Stage Zone Control Panel

MMZ3 Installation & Operating Instructions


MZP4 – 4 Zone All-In-One Zone Control Panel

MZP4 Installation & Operating Instructions


MZS4 – 4 Zone All-In-One Control Panel

MZS4 Installation & Operating Instructions

Accessories

4PDR – 4 Pole Double Throw Relay

4PDR Installation & Operating Instructions


AFC – Anti-Freeze-Up Control

AFC Data Sheet


MDM – Modulating Damper Motor

MDM Installation & Operating Instructions


MP12M – Plug-In Replacement Motor

MP12M Installation & Operating Instructions


MSS – Silent Spring Return Motor

MSS Specs


MST – Motor Switch Terminal

MST Installation & Operating Instructions


OAS – Outside Air Sensor

 


PIRR – Plug-In Replacement Relay

Plug-In Replacement Relay (pdf)


PIW – Plug-In Wires

 


PRC – Plenum Rated Cable

 


SPC – Static Pressure Control

SPC Installation & Operating Instructions


SPS – Static Pressure Switch

SPS Installation & Operating Instructions


T24 – 24 Volt Transformer

24 Volt Transformer Installation & Operating Instructions


ZPS – Zone Plenum Sensor

ZPS
ZPS Installation & Operating Instructions

Thermostats

TDS – Single Digital Stage Thermostat

TDS Data Sheet


TPS – Programmable Single Stage Thermostat

TPS Data Sheet


TTH – Touchscreen Thermostat for Heat Pumps

TTH Data Sheet


TTS – Touchscreen Thermostat Single Stage

TTS Data Sheet


WTR – Wireless Thermostat and Receiver