Framing specifications – Lennox Hearth CR-3835R User Manual
Page 7
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
7
FRAMING SPECIFICATIONS
Figure 15
Figure 14
Figure 12
Figure 13
Figure 16
Framing Dimensions for Ceiling
Flue Type
A
B
FTF8 Vertical
16
¹⁄₂"
16
¹⁄₂"
at 2"
(419 mm)
(419 mm)
FTF10 Vertical
17"
17"
at 1"
(432 mm)
(432 mm)
FTF10 Vertical
19"
19"
at 2"
(483 mm)
(483 mm)
FTF8 Offset 30
°
16
¹⁄₂"
27"
at 2"
(419 mm)
(686 mm)
FTF10 Offset 30
°
17"
26"
at 1"
(432 mm)
(660 mm)
FTF10 Offset 30
°
19"
28"
At 2"
(438 mm)
(711 mm)
Framing Dimensions for Roof
Pitch
FTF8 at 2"
FTF10 at 1"
FTF10 at 2"
C
D*
C
D*
C
D*
0/12
16
¹⁄₂"
16
¹⁄₂"
17"
17"
19"
19"
(419 mm)
(419mm)
(432 mm)
(432 mm)
(483 mm)
(483 mm)
6/12
16
¹⁄₂"
19"
17"
19"
19"
21"
(419 mm)
(483 mm)
(432 mm)
(483 mm)
(483 mm)
(533 mm)
12 /12
16
¹⁄₂"
23
¹⁄₂"
17"
24"
19"
26"
(419mm)
(597mm)
(432mm)
(610 mm)
(483mm)
(660 mm)
*Perpendicular to roof ridge
A
B
Ceiling Framing
C
D
Roof Framing
Framing Without False Header
Header
B
A
C
Outside Corner
C
A
Back Wall of Chase/Encloslure
Including Finishing
Materials if any
Rough Framing
Face (Unfinished
Shown)
Note: All framing dimensions calculated for 5/8"
nailing flange depth and 1/2" dry wall at the
fireplace face. If sheathing the chase or finishing
with other thickness materials, calculations will
need to be made.
Framing Dimensions
CR-3835 Series
A
42
⁵ ₈"
(1082 mm)
B
40
⁵ ₈"
(1032 mm)
C
24"
(610 mm)
D
34
⁷ ₈"
(886 mm)
11
⁷⁄₈"
(302mm)
45
°
8" Max.
(203mm)
8" (203mm) Min. To
Protected Side Wall
Inside Corner Using Outside Air
Note: Combustible Materials
May Be Placed In Shaded Area.
C
D
Note: No Wall Shield
Required On This Wall
Back Wall of Chase/Encloslure Including
Finishing Materials if any
Rough
Framing
Face
(Unfinished
Shown)