11
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
FIREPLACE SPECIFICATIONS
Vent Size
Co-axial DV Vent Size
4-1/2" Inner
7-1/2" Outer
Notes
* The Steady State Effi ciency numbers based on
maximum vent confi guration.
Due to Lennox' ongoing commitment to quality,
all specifi cations, ratings and dimensions are
subject to change without notice.
Unit is shipped with vent seal cap and fl ue cover
plate installed on both fl ue outlets.
Input (BTU) - MV & Electronic
Natural (NG) & Propane (LP) Gas
Models
Fuel
Input Rate (BTU / HR)
SDDV-35
NG
High 27,000
Low 21,000
LP
High 27,000
Low 20,700
SDDV-40
NG
High 30,000
Low 23,500
LP
High 30,000
Low 23,500
Framing Dimensions - Inches (millimeters)
Models
A
B
C
(rear vent)
C
(top vent)
D
E
SDDV-35
35-1/4 (895)
40-1/4 (1022)
20-7/8 (530)
23-5/8 (600)
27-1/2 (699)
46-3/4 (1188)
SDDV-40
40-1/4 (1022)
40-1/4 (1022)
20-7/8 (530)
23-5/8 (600)
27-1/2 (699)
46-3/4 (1188)
Fireplace Dimensions - Inches (millimeters)
Model A
B
C
D
E
F
G
H
SDDV-35
40-1/8 (1019)
37-1/8 (943)
24 (610)
29-1/2 (749)
35-1/8 (892)
27-1/2 (698)
21-1/2 (546)
10-3/4 (273)
SDDV-40
40-1/8 (1019)
37-1/8 (943)
24 (610)
34-1/2 (876)
40-1/8 (1019)
27-1/2 (698)
26-1/2 (675)
13-3/4 (337)
G
H
Top View
Co-Axial Direct Vent Pipe
Collars (Top & Rear Vent)
Flue Outlet - 4-1/2 (114),
Combustion Air - 7-1/2 (190)
(275)
FRAMING
SPACERS
(Top and Sides
and Rear)
10-7/8
F
(13)
ELECTRICAL
INLET
3 (76)
Right Side View
GAS INLET
(Either Side
and bottom)
7
179)
(531)
Hood
(257)
10-1/8
(57)
2-1/4
1/2
20-7/8
D
C
Front View
B
3 (76)
A
E
2 (51)
Figure 13
A
B
E
7
(178)
12-1/8
(308)
12-1/8
(308)
(
267
)
D
VENT FRAMING -
TOP VENT WITH ONE
90
°
ELBOW
VENT FRAMING -
REAR VENT WITH
NO ELBOWS
Inches (mm)
(130)
(130)
7
(178)
C is the required framing depth
dimension when the finish material
(drywall) thickness is 1/2 in. (13mm).
A
C
1/2
10-1/2
5-1/8
5-1/8
**Framing should be constructed
of 2 x 4 or larger lumber.
**Framing With Square Horizontal Termination SV4.5HT-2
Product Reference Information
Cat.
No.
Model
Ship.
Wt.(lbs)
Ship.Vol. (Cubic feet)
H4835
SDDV-35NM
128 Lb's
18.3 cu. ft. -
40-1/4 x 36-7/8 x 21-7/8"
H4836
SDDV-35PM
128 Lb's
18.3 cu. ft. -
40-1/4 x 36-7/8 x 21-7/8"
H4837
SDDV-35NE
128 Lb's
18.3 cu. ft. -
40-1/4 x 36-7/8 x 21-7/8"
H4838
SDDV-40NM
142 Lb's
20.9 cu. ft. -
40-1/4 x 41-5/8 x 21-7/8"
H4839
SDDV-40PM
142 Lb's
20.9 cu. ft. -
40-1/4 x 41-5/8 x 21-7/8"
H4840
SDDV-40NE
142 Lb's
20.9 cu. ft. -
40-1/4 x 41-5/8 x 21-7/8"
