Lennox International Inc MERIT SERIES GAS FURNACE DOWNFLOW AIR DISCHARGE Reducer MAY be, Support

FIELD SUPPLIED WALL TERMINATION OR (15F74) WALL RING TERMINATION KIT

NOTE − FIELD PROVIDED
REDUCER MAY BE		1/2" (13mm) ARMAFLEX
REQUIRED TO ADAPT
		INSULATION IN UN-
LARGER VENT PIPE SIZE
		CONDITIONED SPACE
TO TERMINATION
		SIZE TERMINATION
		PER TABLE 8
		D
		B
C		STRAIGHT
	A	APPPLICATION

FIELD SUPPLIED WALL TERMINATION OR (15F74) WALL RING TERMINATION KIT With INTAKE ELBOW

NOTE − FIELD PROVIDED
REDUCER MAY BE	1/2" (13mm) ARMAFLEX
REQUIRED TO ADAPT
	INSULATION IN UN-
LARGER VENT PIPE SIZE
	CONDITIONED SPACE
TO TERMINATION
	SIZE TERMINATION
	PER TABLE 8
	D
	B
	STRAIGHT
C	APPPLICATION
	A

	1/2" (13mm) ARMAFLEX INSULATION
	IN UNCONDITIONED SPACE
	D
* WALL	E
SUPPORT
	B
	A
C	EXTENDED
	APPLICATION

* WALL

SUPPORT

C

1/2" (13mm) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

D

E

B

A

EXTENDED

APPLICATION

See venting table 7 for maximum venting lengths with this arrangement.

*Use wall support every 24" (610 mm). Use two wall supports if extension is greater than 24" (610 mm) but less than 48" (1219 mm). NOTE − One wall support must be 6" (152 mm) from top of each pipe (intake and exhaust)

	2" (51mm)	3" (76mm)
	Vent Pipe	Vent Pipe
A−Minimum clearance
above grade or average	12" (508MM)	12" (508MM)
snow accumulation
B−Maximum horizontal
separation between	6" (152MM)	6" (152MM)
intake and exhaust
C−Minimum from	8" (203MM)	8" (203MM)
end of exhaust to
inlet of intake
D−Maximum exhaust	12" (305MM)	20" (508MM)
pipe length
E−Maximum wall support
distance from top of each	6" (152MM)	6" (152MM)
pipe (intake/exhaust)

FIGURE 28

See venting table 7 for maximum venting lengths with this arrangement.

*Use wall support every 24" (610 mm). Use two wall supports if extension is greater than 24" (610 mm) but less than 48" (1219 mm). NOTE − One wall support must be 6" (152 mm) from top of each pipe (intake and exhaust)

	2" (51mm)	3" (76mm)
	Vent Pipe	Vent Pipe
A−Minimum clearance	12" (508MM)	12" (508MM)
above grade or average
snow accumulation
B−Maximum horizontal	6" (152MM)	6" (152MM)
separation between
intake and exhaust
C−Minimum from
end of exhaust to	6" (152MM)	6" (152MM)
inlet of intake
D−Maximum exhaust	12" (305MM)	20" (508MM)
pipe length
E−Maximum wall support
distance from top of each	6" (152MM)	6" (152MM)
pipe (intake/exhaust)

FIGURE 29

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