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Horizontal Venting
MEXT Section
PEXT Section
Figure 11. Typical Top Vent installation. The solid sections can be used in
various combinations to obtain the desired vent run. The vent
run must fall within the limits set by the venting graph.
Example 2:
Rigid sections and an elbow used in conjunction with 3 ft. flex section
(MFL-3 / PFL-3) will, when extended in a five foot chase, allow for a
maximum horizontal run of twelve and one-half feet from the centre of
the fireplace to outside wall and a minimum of 7'6" when retracted in
opposite direction (see Figure 12 and 13).
"C" flex sections and "D" rigid sections may be used in conjunction with
one another to obtain different possible horizontal length installations.
NOTE: Flex section with no vertical rise must not exceed maximum
horizontal length of 3 feet (see Figure 14). Flex runs over 3 feet must
fall within the limits set by the venting graph, and must have a minimum
vertical rise of 3" per foot of flex.
Figure 12. Extended Installation using a combination of solid and flex
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
Part No. XG0149
Installation
90° Elbow
Termination
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Figure 13. Retracted Installation using a combination of solid and flex
Figure 14. Horizontal flex installation with no vertical rise.
B. Vertical (Through-The-Roof) Installations
5/8" with option for 4/7" (on applicable models)
Vertical rise >12' can be reduced (on applicable models).
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Vertical Terminations must be installed:
•
•
•
Maximum vent height for the H42DF-O is 35 feet above fireplace.
Note: Flame characteristics will change if the maximum vent height
is used.
Minimum clearances 2" from vent to all combustible materials must
be maintained.
A maximum of two offsets (each offset has two 90° bends) may be
made and shall not exceed total length of 25% of the vertical vent
height, when measured center to center of piping.
H42DF-O Outdoor Gas Fireplace
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
minimum 2' (two feet) above the highest point where
vent passes through the roof.
minimum 6' (six feet) from a mechanical air inlet
minimum 18" (1 1/2 feet) from a parapet wall.
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