Framing; Installation - Lennox DT3025 Installation Instructions Manual

Framing

Wood or metal framing must accommodate unit outer
shell as shown in figure 5. If unit is to be elevated above
floor level, a solid platform providing continuous support
(e.g. plywood decking) must be constructed.
Framing should be constructed of
2x4 or larger lumber.
DT/DTH VENT FRAMING -
TOP VENT WITH ONE
90 _ ELBOW
DR/DRH VENT FRAMING -
REAR VENT WITH
NO ELBOWS
B
Inches (mm)
Model No. A
in. 30-1/4 33-1/4
DR/
DRH
mm 768
3025
DR/ in. 35-1/4 35-1/4
DRH
mm 895
3530
in. 40-1/4 40-1/4
DR/
DRH
mm 1022
4035
in. 45-1/4 40-1/4
DR DR
4540
mm 1149
DT/ in. 30-1/4 33-1/4
DTH
mm 768
3025
DT/ in. 35-1/4 35-1/4
DTH
mm 895
3530
in. 40-1/4 40-1/4
DT/
DTH
mm 1022
4035
in. 45-1/4 40-1/4
DT DT
4540
mm 1149
FRAMING
10-1/2
(267)
7
(178)
5-1/8
(130)
7
(178)
5-1/8
(130)
D
C
15-7/8
(403)
A
B C
18-1/4
845 464
20-1/4
895 514
25-1/4
1022 641
25-1/4
1022 641
- - - -
845 - - - -
- - - -
895 - - - -
- - - -
1022 - - - -
- - - -
1022 - - - -
FIGURE 5

Installation

Installation should be performed by a qualified technician
according to these instructions and local codes.
1 - Carefully remove assembled vented fireplace /
vented fireplace heater from packaging and place in
desired location.
Combustible materials may be installed flush with
both sides and top front edges of the fireplace.
Combustible materials must NEVER overlap the
edges onto the front face of the appliance. Joints
between the finished wall and the fireplace edges
can only be sealed with a 300
sealant.
12-1/8
(308)
Non-combustible materials can be used to cover
the gap between the combustible wall materials
and the fireplace. On flush-faced models, non-
combustible materials may cover the upper portion
of the top panel down to, but not beyond the top of,
12-1/8
(308)
the eyebrow. You must not modify the air inlet or
outlet grills in any way. Access to panels must not
be obstructed.
2 - Lift and remove the bustle; in flush-faced model
applications, remove the top panel; in louvered-
face model applications, remove the louvers.
3 - Lower the bottom hinged panel. Remove three se-
curing screws at the bottom of the glass panel. Care-
D fully lift and remove the shrink-wrapped glass panel/
log set assembly. Lay the assembly down, and cut
- - - -
and remove the shrink-wrapping.
- - - -
4 - Position the logs as shown in figure 6 (3025 units),
- - - -
figure 7 (3530 units), figure 8 (4035 units), or figure
- - - -
9 (4540 units). Handle logs carefully, to prevent
- - - -
breakage. The logs are notched to accommodate
- - - -
the burner tube, pilot assembly and each other.
- - - -
5 - Place rock wool (ember material) as shown in figure 10.
- - - -
NOTE - Your application may not require the use of all
38-1/4
of the provided rock wool. Reserve remaining rock
972
wool for replacement, if necessary.
40-1/4
1022
6 - Remove cardboard from pressure relief valves lo-
45-1/4 cated on top of the firebox.
1149
7 - Secure appliance to floor using fold-down tabs on the
45-1/4
sides of the fireplace. Additional holes for securing
1149 screws are also provided in the base of the unit under
the firebox.
P a g e 6
WARNING
F (149
_
C ) minimum
_