Clearances; Top Vent (Two Elbows One Offset) - Montigo L38DFN Installation And Maintenance Instruction

L38DF* Indoor Gas Fireplace
Section 2: Framing
Frame in the enclosure for the unit with framing materials. The
1).
framed opening for the assembled fireplace is 37 3/4" wide, x 35 1/4"
high x 20 1/8" deep, see Figure 2
L38DF
NOTE: When constructing the framed opening, please ensure
there is access to install the gas line when the unit is installed.
See Figure 2.
2" min.
18" max.
MIN
84"
to
96"
9" 17
"2
1" 0"
1 /
2
Figure 2. Framing dimensions, (Straight wall & Corner
Installation).
Ceiling
Combustible Header
Alcove
area over
Fireplace
1" min.
18" max. 1" min.
Non-
12" max.
MIN
combustible
6"
header 84"
REAR VENT
to
Rear
N.G ONLY
3" 96"
Vent
12"
21 3/4"
door
REAR VENT
opening
N.G ONLY
Floor
Figure 3. Combustible Framing for shelves over the fireplace,
Rear vent. Note: Rear vent available for Natural Gas only.
9"
MEL Short
90° elbow
35 1/4"
35"
29"
1" min.
Figure 4. Combustible Framing for shelves over the fireplace,
Top vent.
xx" Max.
Flex or Rigid
Page 6
Section
24 1/4"
.
9" 17
"2
1"
1 2 /
MIN
Top
Vent
Ceiling
Alcove
area over
Fireplace
Min 1"
Non-
54 1/4"
Acceptable vent run
combustible
6"
header
within non-shaded area.
Rear
3"
Vent
12"
door
opening Unacceptable vent run
4"
within shaded area.
* When sheetrock is not used behind the
fireplace, framing depth 20 1/8" may be
Floor
reduced by 5/8".
N.G. & L.P.
Top Vent
REAR VENT
Cieling
N.G ONLY
Alcove
Combustible Shelf
area over
Fireplace
Min 1"
Non-combustible
9"
header
6"
3"
12"
35 1/4"
29"
door
opening
Floor
Combustible Header
Combustible Shelf
Flex or Rigid
Section
17 1/2"
12"
35 1/4"
Max.
Installation
L38DF 9" 17
"2
1 /
2
Acceptable vent run
within non-shaded area.
Top
Vent
Ceiling
Unacceptable vent run
Alcove
0" 4"
area over
within shaded area.
Fireplace
Min 1"
2" min.
Non-
18" max.
N.G. & L.P.
combustible
6"
Top Vent
header
84"
0" clearance
Cieling
to
Rear
to corners only
96" 3"
Vent
12"
door
Min 1"
1" min.
opening
18" max.
MIN 6"
Floor
84"
to
Rear
96" 3"
Vent
Figure 5. Non Combustible Framing for Top Vent or Rear
Vent, with alcove. Note: Straight through the wall rear
Combustible Header vent available for Natural Gas only.
REAR VENT
Combustible Shelf
N.G ONLY
opening
1" min.

Clearances

Floor
12" max.
9"
46" Min.
When installing a shelf over the top of the fireplaces, the following
guidelines must be adhered to:
For Rear Vent applications, the minimum clearance is 2" from the rear
Combustible Header
35 1/4"
29"
Combustible Shelf
of the fireplace to a wall, or any combustible materials, and 9" clearance
21 3/4"
from the top of the fireplace to the underside of any combustible shelf
materials.
17 1/2"
For Top Vent applications, the minimum clearance is 2" from the rear of
the fireplace to a wall, or any combustible materials, and 17 1/2" to the
MEL Short
underside of any combustible shelf materials.
90° elbow
35"
35 1/4"
(Minimum 2" clearance must still be maintained around the vent
1" min.
pipes.)
Flex or Rigid
Section
36
36" LP
xx" Max.
Max.
24 1/4"
Min.
L38DF*
46" Min.
21 3/4"
46" Min.
1" 0" 4"
N.G. & L.P.
Top Vent
Min 1"
1" min.
18" max.
MIN 6"
84"
to
Rear
96"
Vent
Alcove
area over
Fireplace
REAR VENT
N.G ONLY
Non-combustible
header
36" Min
RHS8 Heat
12"
Shield
Combustible Header
door
Combustible Shelf
PTO Termination
17 1/2"
MEL Short
90° elbow
35"
1" min.
C
xx" Max.
B
24 1/4"
Min.
35" NG & LP
46" Min.
42" NG
46" Min.
12"
21 3/4"
9" 17 1/2"
36" Min
RHS8 Heat
Shield
PTO Termination
Acceptable vent run
within non-shaded area.
Unacceptable vent run
within shaded area.
36" Min
Cieling
Alcove
area over
Fireplace
Non-combustible
46" Min. header
3"
12"
door
opening
Floor
B
Models Included
36
35" NG & LP
36" LP
42" NG
35 1/4"
A
36" Min
1" 1" 0" 4"
XG0180 - 053111
RHS8 He
46" Min.
Shield
PTO Term
Models Included
36
L38DFN
C
L38DFL
L38DFN I
L38DFLI
RHS8 Heat
46" Min.
Shield
PTO Termin