Abstract: The present invention is an expandable duct hanger comprised of two pieces, one piece having a ridge which slides into a channel in the other piece, each piece also having a prong on one end to secure and hold the duct hanger into the floor joists.

Abstract: An extension assembly for use with a damper assembly and for extending the damper assembly control shaft. The extension assembly is provided for coupling of a handle to the control shaft and includes an extension member, a locking member and a securing member. The extension member includes a connecting portion having a closed end and an open end. The open end includes a bore dimensioned to operatively receive the control shaft. The extension member further includes a shaft portion extending longitudinally from the closed end of the connecting portion. The shaft portion includes two parallel flat sides merging transversely with two opposite arcuate sides and dimensioned to be received by an aperture in the handle. The locking member provides the function of locking the control shaft within bore. The securing member ensures that the handle will remain a fixed distance from duct and provides a lock tight surface for a nut to engage and hold the handle.