Lennox International Inc Lennox Merit Series Gas Furnace Upflow/Horizontal Air Discharge, ML193UH

7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other ob­ structions, piping must be supported. At least one bracket must be used within 6” from the top of the el­ bow and then every 24” (610mm) as shown in figure 42, to prevent any movement in any direction. When exhaust and intake piping must be run up an outside wall, the exhaust piping must be terminated with pipe sized per table 8.The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5m) to the equivalent length of the pipe.

8 - A multiple furnace installation may use a group of up to four terminations assembled together horizontally, as shown in figure 40.

	1 1/2” (38mm) accelerator
EXHAUST	provided on 71M80 & 44W92
	kits for ML193UH045P24B,
VENT	070P24B & 070P36B

EXHAUST		12”
		(305mm)
VENT
	5”	5-1/2”
	(127mm)	(140mm)
INTAKE
AIR
	18” MAX.	Front View
	(457mm)

	EXHAUST VENT
			12” (305mm) Min.
				above grade or
Inches (mm)				average snow
		INTAKE		accumulation.
		AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 40

12” (305mm)

Minimum

Above Average

Snow

Accumulation

INTAKE	FLASHING
	(Not Furnished)
AIR
SHEET METAL STRAP
(Clamp and sheet metal strap

2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3”

PVC PIPE

4''

FURNACE

INTAKE

FURNACE EXHAUST PIPE

must be field installed to support

the weight of the termination kit.)

CLAMP

FIELD-PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US) 44W92 or 44W93 (Canada)

PIPE

FLAT

SIDE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

1-1/2” ACCELERATOR

(all -45, -070 and -090 units)

FIGURE 38

FIELD-PROVIDED		1-1/2” (38mm) accelerator
REDUCER MAY BE REQUIRED
		provided on 71M80 & 44W92
TO ADAPT LARGER VENT
		kits for ML193UH045P24B,
PIPE SIZE TO TERMINATION
		070P24B & 070P36B
	OUTSIDE	INTAKE
	WALL
		AIR
EXHAUST
			EXHAUST
VENT			VENT
INTAKE	CLAMP	INTAKE 12” (305mm) Min.
		AIR	above grade or
AIR	(Not Furnished)		average snow
			accumulation.
			GRADE
DIRECT VENT CONCENTRIC WALL TERMINATION
	71M80, 69M29 or 60L46 (US)
	44W92 or 44W93 (Canada)

FIGURE 39

FLUSH-MOUNT SIDE WALL TERMINATION KIT

51W11 (US) or 51W12 (Canada)

FIGURE 41

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