ZoneFirst SPRD-20X8 Damper 30067439-890 The MOPD for this valve

The MOPD for this valve is 550 psi when used with a 10W AC coil and 406 psi with a 20W DC coil

using an OEM Tecumseh relay is essential to maintain the calibrated drop-out voltage required for motor winding protection

This UL 508 listed device utilizes a 1/2-inch nipple mount for direct attachment to electrical boxes

Without an accurate signal

ZoneFirst SPRD-20X8 Damper 30067439-890 The MOPD for this valveThe ZoneFirst SPRD 20X8 is a heavy duty barometric bypass damper engineered for precise static pressure regulation in multi zone residential and light commercial HVAC systems. This 20" x 8" mechanical unit utilizes a field adjustable weighted arm to facilitate effective bypass air management without the requirement for complex electronic controls or wiring. As zone dampers close and duct pressure rises, the ZoneFirst SPRD 20X8 automatically opens to