Lennox Hearth LSO-43 Framing Specifications, Framing Dimensions for Ceiling, Flue Type, FTF10

Note: The framed depth, 25 ⁵⁄₈" (651 mm) from a framed wall, must always be measured from a finished surface. If a wall covering such as drywall is to be attached to the rear wall, then the framed depth must be measured from the drywall surface. It is important that this dimension be exact.

If the appliance is to be elevated above floor level, a solid continuous platform must be constructed.

Consult all local codes.

FRAMING SPECIFICATIONS

Header

B

A

Fireplace Framing

Figure 10

Back Wall of Chase/Enclosure	Outside
Including Finising Materials if any	Air Kit

Framing Dimensions		Back Wall of	Optional		Outside
		Chase/Enclosure	Drainage Line		Air Kit
Fireplace Opening Width		Including Finishing
		Materials if any
	LSO-43	D
		K
A	52 ⁷⁄₈" (1343 mm)				F
B	50" (1270 mm)	C
C	31 ³⁄₄" (806 mm)	A
		E
					Rough
D	15 ⁷⁄₈" (403 mm)	Corner Installation			Framing Face
				(Unfinished Shown)
E	82" (2083 mm)	Figure 12
F	41" (1041 mm)	Back Wall of Chase/Enclosure		Optional	Outside
		Including Finishing		Drainage	Air Kit
G	25 ⁵⁄₈" (651 mm)	Materials if any		Line
J	13 ⁷⁄₈" (352 mm)	G
K	58" (1473 mm)				J
Note: All framing dimensions calculated for 1/2"		A
		Rough Framing Face
dry wall at the fireplace face. If sheathing the				Outside Chase
chase or finishing with other thickness materials,		(Unfinished Shown)
calculations will	need to be made.

Figure 13

Framing Dimensions for Ceiling
Flue Type	A	B	B
FTF10 Vertical	19"	19"
	(483 mm)	(483 mm)
FTF10	19"	29"	A
Offset 30°	(483 mm)	(737 mm)	Ceiling Framing
			Figure 14

A

Inside Chase

Figure 11

G

Rough

Framing Face

(Unfinished

Shown)

Framing Dimensions for Roof
Pitch	C	D*
0/12	19"	19"
	(483 mm)	(483 mm)
6/12	19"	22"
	(483 mm)	(559 mm)
12/12	19"	27"	D	C
	(483 mm)	(686 mm)
* Perpendicular to roof ridge				Roof Framing
			Figure 15

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 7