Abstract: An unvented gas fireplace in which air flow through a closed combustion chamber is controlled by means of a restriction in the air flow path through an outer plenum chamber surrounding the combustion chamber. The restriction in the air flow path through the plenum causes a pressure differential between the plenum and combustion chamber, forcing air from the plenum into the combustion chamber, where it is combusted and mixed with the cool air that has passed the restriction in the plenum, before the air mixture is exhausted into the surrounding room, thereby heating the room.

Abstract: An unvented gas fireplace in which air flow through a closed combustion chamber is controlled by means of a restriction in the air flow path through an outer plenum chamber surrounding the combustion chamber. The restriction in the air flow path through the plenum causes a pressure differential between the plenum and combustion chamber, forcing air from the plenum into the combustion chamber, where it is combusted and mixed with the cool air that has passed the restriction in the plenum, before the air mixture is exhausted into the surrounding room, thereby heating the room.

Abstract: An unvented gas fireplace in which air flow through a dosed combustion chamber is controlled by means of a restriction in the air flow path through an outer plenum chamber surrounding the combustion chamber, causing a pressure differential between the plenum and combustion chamber, forcing air from the plenum into the combustion chamber, where it is combusted and mixed with the cool air that has passed the restriction in the plenum, before the air mixture is exhausted into the surrounding room or area. A diverter selects between exhausting the heated air in the same or the opposite side as the air intake. The unit may be used as an outdoor stand-alone fireplace.

Abstract: A pilot ignition system for an outdoor gas appliance provides a pilot igniter that is isolated from the ambient wind around the burner by physically distancing the pilot igniter from the burners. The distance is overcome by providing a jet of gas to a nozzle slightly upstream of the pilot, the jet of gas being directed toward the burner. The jet of gas is ignited by the pilot resulting in a torch or jet of flame extending from the pilot igniter through the downstream length of an enclosure to the burner. The jet of flame bridges the distance between the pilot igniter and the burner, while the distance itself isolates the pilot light from wind in the vicinity of the burner.

Abstract: A burner and pilot assembly for a gas fireplace has a substantially hollow burner enclosure with a plurality of burner outlet apertures at the top of the enclosure. A pilot burner is mounted within the enclosure to underlie a portion of the outlet apertures such that flame from the pilot burner extends from a portion of the outlet apertures to merge the appearance of the pilot flame with the main burner flame when the main burner is lit. The invention is well-suited to a linear-style gas fireplace burner.

Abstract: A means for avoiding the build up of a film on the inside surface of the transparent window of a gas fireplace comprises providing a mesh screen spaced a short distance of the inside surface. The mesh screen is believed to interrupt the flow of gases toward the window thereby preventing the build up.

Abstract: A burner for a gas fireplace wherein a plurality of apertures are provided along the length of an enclosure and gas inlets are provided for introducing gas into both ends of the enclosure. Movable members are disposed over air inlet holes at each end for selectively restricting the inlet of combustion air into the enclosure thereby allowing control over the longitudinal position of maximum flame from the burner.