Montigo H38DF Installation Operation & Maintenance page 11

B. Multi-Elbow Installations
For more diffiicult installation situations, the H38DF Rear Vent may be
installed with two — 90° elbows and up to 15' of horizontal run. If using
this installation option, you must adhere to the following guidelines:
Important: Rear Vent applications are only for Natural Gas
equipped models. All Propane equipped models must be
installed in a top vent application only.
the first 90° elbow must be placed directly on the flue collar
you must have a minimum vertical lift of 50" (measured from the
hearth)
your vent run must fall within the limits set by Figure 21
Before you install any venting, you must determine whether the venting
run will be acceptable. Unacceptable venting can affect the fireplace's
combustion.
The Venting Graph
Measure the vertical height from the fireplace hearth to the centre of the
termination and the horizontal run from the from the fireplace flue collar to
the wall flange of the termination. Plot on the Venting Graph (Fig. 21)
with an 'X'.
If the 'X' falls on or above the top boundary of the shaded area, the
installation is acceptable.
Example A: (Acceptable Installation)
If the vertical dimension from the hearth is 84" and the horizontal
run to the wall flange of the vent termination is 36", this would be an
acceptable installation.
Example B: (Acceptable Installation)
If the vertical dimension from the hearth is 108" and the horizontal
run to the wall flange of the vent termination is 120", this would be
an acceptable installation.
Example C: (Unacceptable Installation)
If the vertical dimension from the floor of the fireplace is 72" and the
horizontal run to the wall flange of the vent termination is 84", this
would NOT be an acceptable installation.
108
96
84
72
60
48
36
24
12
0
0 12 24 36 48 60 72 84 96 108
Hearth
Horizontal Run (in.)
Figure 21. H38DF Multi-Elbow Venting Graph. (NG Models Only)
Part No. XG0131
Installation
The following venting components are available for an H38DF in a Rear
Vent installation:
NOTES:
Figure 22. Multi-elbow installation. (NG Models Only)
120 132 144 156 168 180
Installation Of Rear Vent DV
A - Termination
B - Stucco Kits
C - Flex sections
D - Solid sections
E - 90 degree elbow
All dimension lengths for vertical or horizontal runs are
measured from center of the vent pipe.
Venting runs must fall within the limits set by the venting
graph (see Figure 21).
18" 8"
Distance 'H' must be a minumum of 50". The vent run
must comply with figure 18a.
H38DF Gas Fireplace
PTO-3 (3" length)
PTO-3F (3" length)
MSR (stucco frame)
BSR-4 (4" brick frame)
BSR-6 (6" brick frame)
MOSR (stucco can)
PFL-1 (12" section)
PFL-2 (24" section)
PFL-3 (36" section)
PFL-4 (48" section)
PEXT-1 (12" section)
PXT-20 (20" section)
PEXT-2 (24" section)
PEXT-3 (36" section)
PEXT-4 (48" section)
PEL-90MM (m/m 90° elbow)
PEL-90FF (f/f 90° elbow)
PEL-90FM (f/m 90° elbow)
PEL-45FM (f/m 45° elbow)
L
H
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