Horizontal Venting-Residential Two Pipes | Lennox International Inc

F-Horizontal Venting-Residential Two Pipes

1-For horizontal residential installations these units are certified as Category I appliances. The vent may be single wall material minimum 25 GSG (0.46mm) galvanized steel or equivalent grade stainless steel or a single section of type B-1 vent installed according to the sections Venting A-General Recommendations and Requirements and C-Horizontal Venting General and F-HorizontalVenting–Residential Two Pipes. Refer to figure 6.

2-The vent pipe diameter for horizontal residential installations shall be 4” (100mm) on 45 units and 5” (127mm) on 60/75/100/125 units. Refer to table 4 for vent diameter and termination requirements.

3-The maximum vent length is 5’ (1.5m) plus one 90- degree elbow.

4-The vent must maintain a ¼” rise per foot of slope upwards toward the termination

TABLE 4

HORIZONTAL VENT REQUIREMENTS

MODEL	INSTALLATION	FLUE TYPE	FLUE DIA.	VENT CAP	MAX. VENT
		AIR INLET TYPE	INLET AIR	INLET AIR CAP	LENGTH (MIN.
			DIA.		VENT LENGTH 3’)
45	RESIDENTIAL	SINGLE WALL	4”	TEE or	5’ MAY USE ONE
				4” BELMONT	SECTION OF
		SINGLE WALL PIPE or	3”	TEE or	B-VENT
		METAL FLEX VENT		3” BELMONT
45	RESIDENTIAL	CONCENTRIC	4”	4” CONCENTRIC	5’
		SINGLE WALL PIPE or	3”	VENT/ ADAPTER/CAP
		METAL FLEX VENT		KIT REQUIRED
45	COMMERCIAL	SINGLE WALL	3”	TEE or	25’ MAY USE ONE
				3” BELMONT	SECTION OF
		SINGLE WALL PIPE or	3”	TEE or	B-VENT
		METAL FLEX VENT		3” BELMONT
45	COMMERCIAL	CONCENTRIC	3”	4” CONCENTRIC	25’
		SINGLE WALL PIPE or	3”	VENT/ ADAPTER/CAP
		METAL FLEX VENT		KIT REQUIRED
60, 75	RESIDENTIAL	SINGLE WALL	5”	TEE or	5’ MAY USE ONE
				5” BELMONT	SECTION OF
		SINGLE WALL PIPE or	4”	TEE or	B-VENT
		METAL FLEX VENT		4” BELMONT
60, 75	RESIDENTIAL	CONCENTRIC	4”	4” CONCENTRIC	5’
		SINGLE WALL PIPE or	4”	VENT/ ADAPTER/CAP
		METAL FLEX VENT		KIT REQUIRED
60, 75	COMMERCIAL	SINGLE WALL	4”	TEE or	25’ MAY USE ONE
				4” BELMONT	SECTION OF B-
		SINGLE WALL PIPE or	4”	TEE or	VENT
		METAL FLEX VENT		4” BELMONT
60, 75	COMMERCIAL	CONCENTRIC	4”	4” CONCENTRIC	25’
		SINGLE WALL PIPE or	4”	VENT/ ADAPTER/CAP
		METAL FLEX VENT		KIT REQUIRED
100, 125	RESIDENTIAL	SINGLE WALL	5”	TEE or	5’ MAY USE ONE
				5” BELMONT	SECTION OF
		SINGLE WALL PIPE or	4”	TEE or	B-VENT
		METAL FLEX VENT		4” BELMONT
100, 125	COMMERCIAL	SINGLE WALL	5”	TEE or	5’ MAY USE ONE
				5” BELMONT	SECTION OF
		SINGLE WALL PIPE or	4”	TEE or	B-VENT
		METAL FLEX VENT		4” BELMONT

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