The Static Pressure Regulating Damper (SPRD) is a round or rectangular single-blade barometric relief damper. It is a mechanical damper with no electrical connections. The blade has a counter-balance weighted arm that can be adjusted to open when necessary. It is recommended for use on zone damper systems up to.5 in. static pressure and up to 2000 cfm. Systems above 2000 cfm may require use of the SPC static pressure control and MARD damper.
The SPRD is used on zoned systems when the automatic closing of zone dampers can create an excessive increase in the air pressure and velocity through the duct system. This increase can reduce the volume of air through the air handler and cause it to trip on high limit or to create ice on the coil.
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