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| Number | Title | Issue Date |
| 7275560 | Pressure relief door for air duct work A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct includes a frame to be mounted in the duct; a gasket in the frame; a hinged door mounted on the frame and sealing against the gasket; and an adjustable pressu... | 10/02/2007 |
| 7069925 | Pressure relief system for a gas fireplace A pressure relief system for a gas fireplace. The pressure relief system has a flue pipe with an opening in its side. A pressure relief plate is coupled to the flue pipe so that it is movable between an open and a closed state. The pressure relief plate positioned s... | 07/04/2006 |
| 6138667 | Direct vent fireplace construction A gas fueled direct vent fireplace has a firebox within an outer casing, the firebox having a mounting plate above the floor of the casing for mounting burner support brackets, a pilot light assembly, a gas valve and control assembly, and other convention... | 10/31/2000 |
| 6009840 | Method for operating a boiler plant When a boiler plant (100), which is equipped with an air plenum (104), is in operation, during the startup phase the admission pressure in this air plenum (104) is lowered in terms of time and amount via a blowoff device (106) with respect to combustion a... | 01/04/2000 |
| 5865165 | Gas fired fireplace boiler A low profile, high efficiency, fireplace boiler wherein a burner tray supports a number of gas fired burners and artificial logs within a hearth area of the firebox and about which logs the gas and flames are distributed. Combustion air is drawn from a c... | 02/02/1999 |
| 5613487 | Fireplace door latch system A gas-fired fireplace comprises an enclosure having a forwardly facing glass panel. The panel is pivotably secured to the enclosure along a lower edge of the panel. The upper edge of the panel is normally spring biased against the enclosure by a latch mec... | 03/25/1997 |
| 5398669 | Explosion dampener An explosion dampener fits with a pressure relief opening in a gas fireplace. The explosion dampener comprises a fireplace mounting bracket, a lever arm pivotally secured to the mounting bracket and an opening sealing member which is secured by a floating... | 03/21/1995 |
| 5309891 | Direct evacuation gas heater or fireplace and safety release valve for said heaters A direct ventilation gas fireplace having co-linear air intake pipe and gas outlet pipe. The pipes are separated from each other so that the fluid flowing in one pipe does not come in contact with the other pipe. The gas outlet pipe may comprise a safety ... | 05/10/1994 |
| 5029533 | Pressure relief mechanism A safety door for a furnace or like apparatus is operable to open under the force of a hydraulic cylinder when the pressure under the furnace exceeds a predetermined upper limit corresponding to an abnormally high pressure caused by an explosion within th... | 07/09/1991 |
| 4770108 | Two-way vent cap for controlled atmosphere furnace A vent cap for a heat treating furnace provides bidirectional pressure relief. The cap is weighted and balanced over the furnace vent such that the vent is closed as long as the furnace has a slightly positive internal pressure. If the internal pressure e... | 09/13/1988 |
| 4368676 | Apparatus for collection of gases and particulates in a furnace feed system A process and apparatus are described for collection of gases and particulates which arise during the feeding of an electric furnace, especially in the manufacture of phosphorus. The collection system for the gases and particulates includes novel explosio... | 01/18/1983 |
| 4327241 | Explosion venting means for metallurgical furnace An explosion venting device for metallurgical furnace enclosures consists of a plurality of panels adapted for restrictive movement relative to the roof and sidewalls of the enclosure and cover openings therein. The panels absorb the shock blast of an exp... | 04/27/1982 |
| 3957001 | Furnace implosion door Damage due to implosions occurring within the furnace chambers of balance draft vapor generators is prevented by the provision in the downstream combustion gas duct of one or more openings that are closed during normal operation by doors which are automat... | 05/18/1976 |
