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Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
Table 10 - Fireplace Framing Specifications
Model
A *
35-7/8
35" Models
(911)
40-7/8
40" Models
(1038)
45-7/8
45" Models
(1165)
C = Minimum height of top vent installations
E = Minimum height of rear vent installations
* Minimum opening size; additional 1/8" per side is recommended.
NOTE: Framing specifications do NOT apply for flexible venting.
When using flexible venting, refer to the kit requirements for framing
specifications.
NOTE: When in top vent mode - No combustible material shall be
allowed to contact the rear flue cap/cover.
Table 11 - Fireplace Framing Specifications - Corner Installation with Horizontal Termination
Model
A
B
35-7/8
59-1/2
35"
(911)
(1511)
40-7/8
63-7/8
40"
(1038)
(1622)
45-7/8
70-3/8
45"
(1165)
(1788)
Table 12 - Fireplace Specifications
NOTE: When in top vent mode, No combustible material shall be allowed to contact the rear flue cap/cover.
F
G
* C and D are glass viewing area dimensions
Top View
Model
A
35" Models
32-1/8 (816)
26-5/8 (677)
40" Models
37-1/8 (943)
34-5/8 (880)
45"Models
37-1/8 (943)
34-5/8 (880)
B
C
D**
36-1/4
38-3/4
18-1/2
(920)
(984)
(470)
41-1/4
43-3/4
18-1/2
(1148)
(1111)
(470)
41-1/4
43-3/4
18-1/2
(1148)
(1111)
(470)
C
D
E
42-1/8
30-1/4
14-1/4
(1070)
(768)
(362)
45-3/8
33-1/4
15-7/8
(1153)
(845)
(403)
49-3/4
35-1/4
17-1/2
(1264)
(895)
(445)
I
A
D*
K
Inches (millimeters)
Front View
B
C*
D*
19-1/2 (496)
29-1/4 (743)
24-1/2 (623)
34-1/4 (870)
24-1/2 (623)
39-1/4 (997)
**NOTE: Dimension "D" is the
E
required framing depth when
23-3/8
units are installed with the
(594)
fireplace face flush to framing
28-1/4
(717)
Vent Framing—Top Vent
with One 90° Elbow
28-1/4
(717)
B
Inches (millimeters)
F
Front to rear with 1" distance to wall
6-5/8
(168)
8-1/2
(216)
10-1/4
(260)
C
Back wall of chase/enclosure (including finishing materials)
E
C*
B
Blower
access panel
H
E
F
G
35-1/4 (895)
25 (635)
12-1/2 (317)
40-1/4 (1022)
30 (762)
15 (381)
45-1/4 (1149)
35 (889)
17-1/2 (445)
10-1/2
(267)
5-1/8
(130)
7 (178)
5-1/8
C
(130)
E
D
1/2 A
A
E
F
A
B
J
Hood
Gas line
access
Left Side View
H
I
32-7/8 (835)
6-7/8 (175)
17 (432)
37-7/8 (962)
6-7/8 (175)
17 (432)
42-7/8 (1089)
6-7/8 (175)
17 (432)
Installation
900960-00D, 04/2020
Framing
construction to be
2 x 4, or larger.
7 (178)
12-1/8
(308)
7 (178)
D
Inches
(millimeters)
K
Junction
box access
Right Side View
J
K
10-1/8 (258)
10-1/8 (258)
10-1/8 (258)
17
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