Montigo B34DV Installation, Operation & Maintenance Manual page 11

B. Vertical (Through-The-Roof) Installations
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.
A - Termination MVTK-1
B - Stucco Kits
MSR (Stucco Frame)
MOSR (Stucco Can)
BSR ( Brick Can)
C - Flex Sections MFL-1 (12" f/f Section)
MFL-2 (24" f/f Section)
MFL-3 (36" f/f Section)
MFL-4 (48" f/f Section)
MFL-6 (72" f/f Section)
D - 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)
MEXT-6 (72" m/f Section)
E - Support Ring
MSPXT-7
& Plate
F - Firestop FS-7
G - Roof Flashing MRF-7 (1/12 - 7/12 pt.)
MRF-12 (7/12 - 12/12 pt.)
MEXT
MXT-10
Figure 14. Straight, vertical venting showing required MXT-10
adaptor (supplied with the MVTK-1 termination).
Part No. XG0160 - 151125
Installation
4" / 7" Venting
MEXT
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.
Figure 15. Vertical venting with 1 offset (1 offset= two 90°
bends).
Figure 16. Vertical venting with 2 offsets (1 offset= two
90° bends).
B-Series DV-2 Gas Fireplace
Page 11