Heated plumbing vent

Abstract From the Canadian patent

A heated vent is provided which can be coupled to a pipe originating from a plumbing system within a building. A heating cable is wound around an inner cylinder which is wrapped in a conductive foil and enveloped by a larger diameter outer cylinder which is lined with a reflective foil defining a void there between. The cylinders are secured at an upper end by an end cap and at a lower end by a lower end cap and a tether is tautly secured within the inner cylinder by a bridge in an opening of the end cap and a lower disk engaged with the lower end of the inner cylinder to support ice blocks formed therein. The heating cable radiates heat which is reflected by the reflective foil and …