Lennox Hearth CR-3835R Framing Specifications, Framing Dimensions for Ceiling, Flue Type, Pitch

FRAMING SPECIFICATIONS

Back Wall of Chase/Encloslure Including	Note: No Wall Shield
Finishing Materials if any	Required On This Wall
	D

B

Header

A

C

Rough

Framing

Face

(Unfinished

Shown)

11⁷⁄₈"

(302mm)

45°

C

8" Max.

(203mm)

8" (203mm) Min. To

Protected Side Wall

Framing Without False Header

Figure 12

Figure 14	Note: Combustible Materials	Inside Corner Using Outside Air
	May Be Placed In Shaded Area.

Back Wall of Chase/Encloslure

Including Finishing

Materials if any

C

Rough Framing		A
Face (Unfinished	Outside Corner
Shown)

Figure 13

Framing Dimensions for Ceiling

Framing Dimensions

CR-3835 Series

A	42 ⁵	"
	(1082 mm)
B	40 ⁵	"
	(1032 mm)
C	24"
	(610 mm)
D	34 ⁷	"
	(886 mm)

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.

D

C

Roof Framing

Figure 15

B

A

Ceiling Framing

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)

Figure 16

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

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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