Safety Rules: Liquefied Petroleum Gas Division Page: J4
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permanently sealed. Before connecting a venting system to any chimney, the chimney shall be inspected
and found free of obstructions.
(i) Type B, BW, and Type L venting systems shall terminate in a listed cap, marked "UL." Refer to
Figure 2 in 9.247 of this title (relating to Power Venting) to determine the minimum height a venting
system shall extend above a roof surface.
9.247. Power Venting.
(a) Gas appliances, except incinerators, requiring venting may be vented by means of mechanical draft
systems of either forced or induced systems.8' -
7'
6'
5
4-
3'
2'
I
0
FLABELMONT TOP
HEIGHTS ON
PITCHED ROOFS
2/12 4/12 6/12 8 2 12 12/12 14/12 16/12SEE FIGURE 4A
FOR HEIGHT ABOVE
ROOF
F P 12
ROOF PITCH OVER T/12 TO 18/12ROOF PITCH
I
figure 2
VENT LESS THAN 8 FROM WALL
2 FEET
DO THIS-1
7'
6'
5'
4'
3'
2'
0
18/12NEVER
00 THISVENT LESS THAN 8 FEET FROM WALL: LOCATE BELMONT TOP
2 FEET ABOVE WALL(b) All portions of such systems under positive pressure shall be designed, constructed, and installed to
prevent leakage of combustion products into a building.
(c) Vents from other gas appliances shall not be connected into vents under positive pressure.
(d) Gas appliances employing mechanical draft systems'shall be provided with means to prevent the
flow of gas to the main burner(s) when the mechanical draft system fails to provide proper draft.
(e) The exit terminals of mechanical draft systems shall be located not less than 12 inches from any
opening through which combustion products could enter the building, nor less than two feet from an
adjacent building, and not less than seven feet above grade when located adjacent to public walkways.J-4
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14/12 16/12
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Railroad Commission of Texas. Liquefied Petroleum Gas Division. Safety Rules: Liquefied Petroleum Gas Division, book, November 1990; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1544630/m1/88/?q=%22%5B1990..%5D%22: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.