Power venter

Abstract

A power venter for connection to an appliance vent system to provide draft and gas flow and which has components mounted exteriorly of a building wall and components extending through the wall, with the latter components including an inner pipe connectable to a vent pipe of a vent system and an outer pipe surrounding the inner pipe in spaced relation functioning as a heat shield and providing an annular space therebetween. The outside components include a vent hood with a blower housing mounted interiorly thereof and having a blower with an inlet communicating with an outside end of the inner pipe and having a blower outlet to atmosphere. An orifice plate is associated with the blower to separate positive and negative pressure areas and has an orifice opening leading to an eye of the blower, with the blower rotatable about an axis offset from the longitudinal axis of the inner pipe to provide a desired blower diffuser angle. The scroll of the blower housing is defined by an outside section of one of the pipes and, more particularly by a section of the outer pipe whereby the outer pipe diameter may be selected for the desired diameter of blower wheel without affecting the diameter of the inner pipe which connects to the vent system. The annular space between the inner and outer pipes communicates with the outside for flow of outside air into the annular space and with this annular space either connectable to a duct extending to a fuel-burning appliance for supplying makeup air or being closed off at the inside end of the outer pipe for delivery to the flue gases within the inner pipe through an opening in the wall of the inner pipe.