ZoneFirst AOBD-20X10 Damper 328140-751 Engineered with a durable cast

Engineered with a durable cast iron body and a 2-inch NPT connection

and gaskets eventually fail under thermal cycling

this unit operates at 208/230V and delivers 1/16 HP at a consistent 3450 RPM

it is highly recommended to inspect all burners in the assembly and replace any that show signs of significant scaling or blocked ports

this is an automatic reset switch

ZoneFirst AOBD-20X10 Damper 328140-751 Engineered with a durable castThe 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