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This unit is built for continuous air-over (DAO) operation
What is the difference between the silver and other color-coded Spence springs
Always verify the required orifice quantity and drill size in your heater's manual
the sensor wire is likely the failure point
ZoneFirst AOBD-20X10 Damper 320788-703 This unit is built forThe ZoneFirst AOBD 20X10 Damper is a professional grade automatic opposed blade damper engineered for precision bypass and zone control in high demand residential and commercial ductwork. This 20" wide by 10" high unit features an anodized extruded aluminum frame and blades, ensuring a low profile footprint that fits into 3 inch slots for streamlined side mount installation. Each blade is connected via a stainless steel draw bar and nickel plated
