Retrofit damper assembly with dual seal

A damper assembly for use in a forced air duct feeding one or more register vents, the damper assembly comprising:

• a damper frame defining an inner frame periphery and an outer frame periphery, the inner frame periphery defining an air flow aperture, the outer frame periphery defining a first shape;
• a damper blade pivotally secured relative to the damper frame and is pivotable between an open position and a closed position, wherein in the closed position the damper blade seals against the damper frame and substantially blocks air flow through the air flow aperture, and wherein in the open position the damper blade does not seal against the damper frame and allows air flow through the air flow aperture;
• a flexible outer seal extending radially outwardly from the outer frame periphery of the damper frame and configured to seal against an inner surface of the forced air duct when the damper assembly is deployed within the forced air duct, the flexible outer seal having an outer periphery defining a second shape, wherein the second shape is different from the first shape.