Top Vent Vertical Venting Runs - Montigo M40DV-CR Installation Operation & Maintenance

M40DV-CR/CL Corner Gas Fireplace
Installation Of Vertical Vent DV
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 30 feet above fireplace.

Note: Flame characteristics will change if the maximum vent
height is used.
Minimum clearance to combustible construction around the

vent pipe is 1" on all sides must be maintained, except on hori-
zontal venting where the top of the pipe must have a clearance of
at least 2".
A - Termination
B - Flex sections
C - Solid sections
D - Support Ring & Plate
E - Firestop
F - Roof Flashing
Figure 16. Straight, vertical venting.
* If reducing to 4"/7" venting see figure 19.
Page 12
Installation
PVTK-1
PFL-1 (12" section)
PFL-2 (24" section)
PFL-3 (36" section)
PFL-4 (48" section)
PEXT-1 (12" section)
PEXT-2 (24" section)
PEXT-3 (36" section)
PEXT-4 (48" section)
PSPXT-7 (8" dia.)
PS-8 (8" dia.)
PRF-7 (1/12 - 7/12 pitch)
PRF-12 (7/12 - 12/12 pt.)
Top Vent
A maximum of two offsets (each offset has two 90° bends) may be

made if the length of the offsets does not exceed 25% of the vertical
vent height, when measured center to center of piping.
Example: Typical vent installation.
30' vertical vent
2 - 2' offsets required
25% of 30' = 7-1/2' max. offset allowed
This venting configuration meets requirements.
Figure 17. Vertical venting using 1 offset (1 offset= two 90° bends).
* If reducing to 4"/7" venting see figure 19.
Figure 18. Vertical venting using 2 offsets (1 offset= two 90° bends).
* If reducing to 4"/7" venting see figure 19.
P/N XG0206