Montigo H34DF Installation Operation & Maintenance page 9

Figure 13. Retracted Installation using a combination of solid and flex
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
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).

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:

• 32 feet above fireplace.
H34DF
• 35 feet above fireplace.
H38DF
• 35 feet above fireplace.
H42DF
Note: Flame characteristics will change if the maximum vent height
is used.
Minimum clearances 2" from vent to all combustible materials must

be maintained.
Part No. XG0145
Installation
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:
This venting configuration meets requirements.
A - Termination
B - Flex Sections
C - Rigid Sections
D - Support Ring
& Plate
E - Firestop
F - Roof Flashing
G - Adaptor / Vent
Reducer
MEXT/PEXT
MXT-10/PXT-10
Figure 15. Straight, vertical venting showing required MXT-10/PXT-10
adaptor (supplied with the MVKT-1/PVTK-1 termination).
H-Series DF Gas Fireplace
Typical vent installation.
20' vertical vent
2 - 2' offsets required
25% of 20' = 5' max. offset allowed
4" / 7" Venting
MVTK-1 PVTK-1
MFL-1 (12" Section) PFL-1 (12" Section)
MFL-2 (24" Section) PFL-2 (24" Section)
MFL-3 (36" Section) PFL-3 (36" Section)
MFL-4 (48" Section) PFL-4 (48" Section)
MEXT-1 (12" m/f Section) PEXT-1 (12" m/f Section)
MEXT-2 (24" m/f Section) PEXT-2 (24" m/f Section)
MEXT-3 (36" m/f Section) PEXT-3 (36" m/f Section)
MEXT-4 (48" m/f Section) PEXT-4 (48" m/f Section)
MSPXT-8 PSPXT-8
FS-8 PS-8
MRF-7 (1/12 - 7/12 pt.) PRF-7 (1/12 - 7/12 pt.)
MRF-12 (7/12 - 12/12 pt.) PRF-7 (7/12 - 12/12 pt.)
PVA5487 (5"/8" to 4"/7")
5" / 8" Venting
MEXT/PEXT
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