Patent ID: 6179705
Filing Date: 2001-01-30
Classification: F23L

Abstract:
An accessory for venting combustion devices for preventing downdrafting and allowing for proper ventilation comprising, in combination:a vertically disposed vent pipe for extending upwardly from a combustion device, the vent pipe having a generally cylindrical configuration with an interior, the vent pipe having a plurality of axially-aligned segments including a lower pipe segment, a medial pipe segment, and an upper pipe segment, a vent gap being formed between each of the pipe segments, each of the pipe segments having an open upper end and an open lower end, the open upper end of the lower pipe segment having a plurality of circumferentially spaced lower brackets extending upwardly therefrom, the open lower end of the medial pipe segment being mounted on upper ends of the lower brackets to produce a gap between the open upper end of the lower pipe segment and the open lower end of the medial pipe segment to form a first vent gap, the open upper end of the medial pipe segment having a plurality of circumferentially spaced medial brackets extending upwardly therefrom, the open lower end of the upper pipe segment being mounted on upper ends of the medial brackets to produce a gap between the open upper end of the medial pipe segment and the open lower end of the upper pipe segment to form a second vent gap, the open upper end of the upper pipe segment having a plurality of circumferentially spaced upper brackets extending upwardly therefrom;a draft hood secured around the open lower end of the medial pipe segment to locate an upper end of the draft hood above the first vent gap, the draft hood including a frusto-conical body portion extending downwardly about the lower pipe segment, the draft hood including a frusto-conical neck portion extending between the medial pipe segment and the body portion of the draft hood, an upper end of the neck portion being secured to the medial pipe segment, the draft hood being adapted to permit air to enter the first vent gap into the interior of the vent pipe without disturbance from a horizontally moving draft;a frusto-conical annular flange secured around the upper pipe segment at the open lower end of the upper pipe segment to locate the annular flange above the second vent gap; anda vent cap removably secured to upper ends of the upper brackets of the upper pipe segment for diverting precipitation from entering the open upper end of the upper pipe segment, the vent cap being disposed over the open upper end of the upper pipe segment to produce a gap between the vent cap and the open upper end of the upper pipe segment to form a third vent gap for permitting exhaust gases to exit the vent pipe, the vent cap having a generally domed shape.