making it a versatile choice for both chilled water and hot water applications

Diaphragms must be matched strictly to the fluid or gas they are rated for

Verify mounting plate dimensions and terminal clearance before attempting use on other burner brands

including Armstrong Air

Versatile Compatibility: Rated for use with modern HFC refrigerants and synthetic oils

ZoneFirst SPRD-20X8 Damper Els PW 17895 making it a versatile choiceThe 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