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Installation Clearances
Clearances to Combustibles
The Lennox Merit
t
Series vented fireplaces / vented fire-
place heaters are approved with zero clearance to com-
bustible materials on all sides (as detailed in table 2), with
the following exception: When the unit is installed with
one side flush with a wall, the wall on the other side of the
unit must not extend beyond the front edge of the unit. In
addition, when the unit is recessed, the side walls sur-
rounding the unit must not extend beyond the front edge
of the unit. See figure 2.
Mantel Clearances
Vertical installation clearances to combustible mantels
vary according to the depth of the mantel. Figure 3 details
these required clearances. Mantels constructed of non-
combustible materials may be installed at any height
above the appliance opening; however, do not allow any-
thing to hang below the eyebrow.
NOTE - Paint or lacquer used to finish the mantel must be
heat resistant in order to avoid discoloration.
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
6 (152) MANTEL
4 (102) MANTEL
4
(102)
14
(356)
12
(305)
10
(254)
2 (51) MANTEL
TOP OF
APPLIANCE
6
(152)
NOTE - Eyebrow shown as positioned
in louvered front model. The eyebrow
position in the flush faced front model
is lower than shown.
8
(203)
MANTEL CLEARANCES
Inches (mm)
FIGURE 3
Corner Installations
Units installed across the corner of two joining walls re-
quire a minimum diagonal span as detailed in figure 4.
This span accommodates the unit depth.
A
B
C
D
E
Back wall of chase/enclosure
(including any finishing materials)
DT/DTH
DR/DRH
a
7 in.
(178 mm)
RECTANGULAR
TERMINATION
NOTE -
Venting requirements for DR/DRH Units (Rear Vent Units)
in corner installations -
- The rectangular termination must be used.
- For the 3025, 3530, and 4035 models, the horizontal vent
length “a” to “b,” must not exceed 28 in. (711mm).
b
F
CORNER INSTALLATIONS
Top (DT/DTH) or Rear (DR/DRH) Vent Application
Model No.
A
B
C
D
E
F
in.
30-1/8
57-1/2
40-5/8
13-1/2
28-3/4
5
DT/DTH/DR/DRH 3025
mm
765
1461
1032
343
730
127
in.
35-1/8
57-1/2
40-5/8
13-1/2
28-3/4
5
DT/DTH/DR/DRH 3530
mm
892
1461
1032
343
730
127
in.
40-1/8
61-3/16
43-11/32
15-7/16
30-11/16
6-3/8
DT/DTH/DR/DRH 4035
mm
1019
1554
1101
392
779
162
FIGURE 4
