Page 2
DT/DTH/DR/DRH Unit Dimensions - inches (mm)
A
B
C
D
E
F**
G
16
(406)
1/2 (13)
1-5/8
(42)
9-3/4
(248)
3 (76)
TOP VIEW
NOTE - Eyebrow
hood shown as positioned
in louvered front model.
*CONCENTRIC FLUE
FLUE - 4-1/2 (114)
COMBUSTION AIR - 7-1/2 (190)
FRAMING
SPACERS
(Top and Sides
and Rear)
GAS INLET
(Either Side
and bottom)
* DT/DTH - top flue only
DR/DRH - rear flue only
FRONT VIEW
RIGHT SIDE VIEW
3 (76)
2 (51)
(Louvered Front Model Shown)
**DR/DRH - rear flue only
7 (178)
2 (51)
ELECTRICAL
INLET
2-3/4x2 (70x51)
COVER PLATE with
KNOCKOUT)
Model No. A B C D E **F G
T/D
3025
in. 19-7/8 30-1/8 30-1/8 24-1/2 14
18-1/4
9-15/16
T/D
3025
DTH/DRH3025
mm 505 765 765 616 356
464
252
DT/DR3530
in. 24-7/8 35-1/8 32-1/8 29-1/2 16
20-1/4
12-7/16
T/D
3530
DTH/DRH3530
mm 632 892 816 749 406
514
316
DT/DR4035
in. 29-7/8 40-1/8 37-1/8 34-1/2 21
25-1/4
14-15/16
T/D
4035
DTH/DRH4035
mm 759 1019 943 876 533
641
379
in. 34-7/8 45-1/8 37-1/8 39-1/2 21
25-1/4
17-7/16
T/D
4540
mm 886 1146 943 1003 533
641
443
FIGURE 1
Meritt Series - DT/DTH/DR/DRH
Merit
t
Series fireplaces are sealed-combustion (direct
vent), heat-circulating gas appliances. The appliances
utilize a 100 percent safety shut-off gas control with either
a Piezo ignition system or an electronic ignition system.
Models equipped with either electronic ignition or the op-
tional forced air fan assembly require 120V electrical con-
nection. Decorative trim kits, a brickaded firebox lining,
forced air fan assemblies, a wall thermostat (for use with
vented gas fireplace heater models only), and hand-held
remote ON/OFF controls are available as options. Refer
to table 1 for model designations.
The fireplace has provisions forside(s) orbottom entry for
gas piping. This appliance must be vented to the outside
and must not be connected to a flue servicing another ap-
pliance.
The appliance must be installed using only approved Lennox
concentric venting components (4-1/2 in. / 7-1/2 in.).
Themillivoltgasvalveusedinnon-electronicigni-
tion units is self-powered and does not require
120V power wiring.
Do not attempt to alter or modify the construction of the
appliance or venting components. Any modification or al-
teration of construction will void the warranty, certification
and approval of these units.
In vented gas fireplace heater models, burner operation
can be controlled by: a unit- or wall-mounted ON / OFF
switch, or an approved thermostat.
In vented gas fireplace models, burner operation can be
controlled by: a unit- or wall-mounted ON / OFF switch.
On models with the optional manually-modulated gas valve,
flame appearance and heat output can be controlled at the
gas valve.
TABLE 1
Models Listed
to Vented Gas
Fireplace
Standard
Models Listed to
Vented Gas
Fireplace Heater
Standard
Suffixes Used with
Both Models
DT/DR3025
DT/DR3530
DT/DR4035
DT/DR4540
DTH/DRH3025
DTH/DRH3530
DTH/DRH4035
C - Louver front
F - Flush-Faced Front*
N-NaturalGas
P - Propane Gas (LP)
M - Millivolt System
E - Electronic system
*DRH/DTH models available with louver front only.
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