Montigo L38DF series Installation & Maintenance Manual page 10

L38DF Flush Indoor Gas Fireplace
Figure 15. Retracted Installation using a combination of solid and flex
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
Figure 16. Horizontal flex installation with MIN vertical rise.
B. Vertical (Through-The-Roof) 5/8 Installations
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 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.
 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
Page 10
Installation
RHS8
19"max
RHS8
41"
min.
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
* Minimum 1-1/2" clearance to combustibles
Figure 16a. Vertical venting with 1 offset (1 offset= two 90° bends).
2 MIN
1 MIN
Figure 16b. RHS8 Installation. (Install by sliding over vent pipe where
it passes through the combustible contruction.
f i r e f e a t u r e
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.)
PRF-7 (7/12 - 12/12 pt.)
PVA5487 (5"/8" to 4"/7")
RHS8
Heat Shield
Part No. XG0180 - 081009