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this is an automatic reset switch
ensuring the gap remains at factory settings
it is highly recommended to inspect all burners in the assembly and replace any that show signs of significant scaling or blocked ports
the gasket provides a sufficient mechanical seal
Engineered with a durable cast iron body and a 2-inch NPT connection
ZoneFirst AOBD-20X10 Damper 328140-751 this is an automatic resetThe 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