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PART #: SPRD2012 - DMPR ZONING RECT BYPASS BARO 20X12
PART #: S1-SPRD2012
S1-SPRD2012


 
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Product Code: S1-SPRD2012
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Description
 

Source 1 Barometric By-Pass Dampers

The Static Pressure Regulating Dampers, Model SPRD, are barometric relief dampers used to by-pass excess air pressure on zoned systems. The SPRDs
automatically respond to the air pressure in duct as the various zone dampers open and close.
As zone dampers close off air to a number of zones, the supply air pressure in the duct system will increase. This increase in air pressure can increase the
noise level and reduce the flow of conditioned air through the HVAC Unit. Using the SPRD solves this by automatically compensating for the excess air
pressure by opening on the increased pressure and relieving the excess air. The SPRD helps maintain a constant air pressure in the duct system. This
reduces noise that is caused by high air pressures and velocities, as well as maintains a constant volume of air (CFM) through the duct system. Maintaining
a constant volume of air through the HVAC System keeps the efficiency of the system at its maximum.
The SPRD is available in square/rectangular and round sizes. The following chart lists the available sizes of SPRDs and their recommended CFM
capacities.



Calculating By-Pass Air Requirements:
Determining the need for by-pass air and the size of the SPRD required is very simple. It can be very simply calculated by knowing the total CFM capacity
of the HVAC unit (TCFM) and subtracting the CFM capacity of the smallest zone (SCFM) will equal the CFM of air required to be by-passed (BCFM).
TCFM – SCFM = BCFM (Total CFM minus Smallest Zone CFM equals By-Pass CFM)
Once the by-pass amount of air is known, use the chart below to select an appropriately sized by-pass damper. It is always recommended to have a larger
size by-pass than having one that is too small. It is much easier to reduce bypass air through the damper or close it off than having to increase the size of
the by-pass duct and/or damper.
Location:
Selecting a location to place the SPRD is very important for overall system operation. Ideally the best place for the SPRD is as far away from the air
handler as possible and before any zone dampers. In an extended plenum application where zones come of the side of the main trunk, the end of the
extended plenum is the ideal situation.
Square and Rectangular SPRD Damper
Specifications:
Construction: 22 Gauge Zinc Plated Steel
Dimensions: 12”x8”, 12”x10”, 12”x12”, 20”x8”, 20”x10”, 20”x12”
Humidity: 5% to 95% Non-Condensing
Static Pressure: Maximum 0.5” W.C.
Round SPRD Damper Specifications:
Construction: 22 Gauge Galvanized Steel
Dimensions: 5”, 6”, 7”, 8”, 9”, 10”,12”, 14”, 16”, 18”, 20” Diameters
Temperature Rating: 0°F to 180°F Operating, –20°F to 140°F Storage
Humidity: 5% to 95% Non-Condensing
Static Pressure: Maximum 0.5” W.C

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