Terminations; Horizontal Venting - Montigo H38DF Installation Operation & Maintenance

H38DF Gas Fireplace

Horizontal Venting

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
(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 10 and 11).
"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.
Page 8
Installation
90° Elbow
Termination
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"
Vertical rise >12' can be reduced, see next page.
Vertical Terminations must be installed:
• 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.
Maximum vent height 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.
Example: Typical vent installation.
This venting configuration meets requirements.
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
20' vertical vent
2 - 2' offsets required
25% of 20' = 5' max. offset allowed
Part No. XG0131