A first wall of a double walled vent duct may enclose the opening, while the second wall encloses the hole.doi:US5267552 ASquires, David G.Wilkes, Andrew C. G.Kovacs, James E.USUS5267552 May 29, 1992 Dec 7, 1993 Hunter Enterprises (Orillia) Limited Direct vent gas fireplace...
The minimum ventilation requirement has been quoted as 8 m3 h−1/cap. (Ross and Williams, 1975), but may be more if the ventilation air is polluted by e.g. automobile exhaust or if tobacco smoking, open air cooking, fireplace combustion or similar practices take place on the premises. ...
fireplace insert of FIGS. 9 and 10 have been shown having a coaxial stack, and FIG. 10 extends through an existing masonry chimney, it is also possible to connect the source of fresh air directly through a vent extending horizontally through the masonry chimney and through panel 35. In a ...
A direct vent gas fireplace has a firebox surrounded by an enclosure. The enclosure has an inclined surface between the top, rear and sides. The surface is inclined at approximately 45 degrees and has an exhaust opening. The firebox has an inclined surface parallel to the inclined panel and ...
A termination device for a through the wall connection to the double walled coaxial ducting of a horizontal direct vented gas fireplace or the like comprising a mounting means having an opening therethrough for mounting said device on the exterior of a wall having a passage therethrough with the...