Montigo C34DV Installation & Maintenance Manual page 9

B. Vertical (Through-The-Roof) Installations
Vertical rise > 12' can be reduced

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.

Note: Flame characteristics will change if the maximum vent height
is used.
Minimum clearances 1" from vent to all combustible materials must

be maintained.
4" / 7" Venting
A - Termination MVTK-1
B - Flex Sections MFL-1 (12" Section)
MFL-2 (24" Section)
MFL-3 (36" Section)
MFL-4 (48" Section)
C - Rigid Sections MEXT-1 (12" m/f Section)
MEXT-2 (24" m/f Section)
MEXT-3 (36" m/f Section)
MEXT-4 (48" m/f Section)
D - Support Ring MSPXT-8
& Plate
E - Firestop FS-8
F - Roof Flashing MRF-7 (1/12 - 7/12 pt.)
MRF-12 (7/12 - 12/12 pt.)
G - Adaptor / Vent
Reducer
MEXT/PEXT
MXT-10/PXT-10
Figure 15. Straight, vertical venting showing required PXT-10 adaptor
(supplied with the PVTK-1 termination).
Part No. XG0170 - 080610
Installation

5" / 8" Venting
PVTK-1
PFL-1 (12" Section)
PFL-2 (24" Section)
PFL-3 (36" Section)
PFL-4 (48" Section)
PEXT-1 (12" m/f Section)
PEXT-2 (24" m/f Section)
PEXT-3 (36" m/f Section)
PEXT-4 (48" m/f Section)
PSPXT-8
PS-8
PRF-7 (1/12 - 7/12 pt.)
Figure 16. Vertical venting with 1 offset (1 offset= two 90° bends).
PRF-7 (7/12 - 12/12 pt.)
PVA5487 (5"/8" to 4"/7")
MEXT/PEXT
Figure 17. Vertical venting with 2 offsets (1 offset= two 90° bends).
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.
20' vertical vent
2 - 2' offsets required
25% of 20' = 5' max. offset allowed
This venting configuration meets requirements.
C-Series DV Gas Fireplace
Page 9