Zonefirst SPRD-18 Damper 30067439-890 these part numbers are technically

these part numbers are technically identical and serve as direct replacements for each other in all Lennox-brand applications

Does this cover include the mounting hardware or gaskets

While the diameter is 24 inches

this specific model is rated for 120V/50-60Hz

Zonefirst SPRD-18 Damper 30067439-890 these part numbers are technicallyThe Zonefirst SPRD 18 is a professional grade 18 inch round barometric bypass damper engineered to maintain critical static pressure relief in multi zone HVAC applications. As zone dampers close, this single blade mechanical component automatically responds to rising pressure, diverting excess airflow to the return plenum or a dump zone to prevent coil icing and blower motor strain. Unlike motorized alternatives, the SPRD 18 utilizes a counter