Bryant 345MAV instruction manual Ðmaximum Allowable Vent Pipe Length Ft, Ð25Ð

TABLE 4ÐMAXIMUM ALLOWABLE VENT PIPE LENGTH (FT)

ALTITUDE (FT)	UNIT SIZE	VENT PIPE				NUMBER OF 90° ELBOWS
		DIAMETER (IN.)	1		2		3	4	5	6
	024040	1	5			NA	NA	NA	NA	NA
		1-1/2	70		70		65	60	60	55
	036040
		2	70		70		70	70	70	70
	024060	1-1/2	20		15		10	5	NA	NA
	036060
		2	70		70		70	70	70	70
	048060
0 to 2000	036080	1-1/2	10			NA	NA	NA	NA	NA
	048080	2	55		50		35	30	30	20
	060080
		2-1/2	70		70		70	70	70	70
	048100	2	5			NA	NA	NA	NA	NA
		2-1/2	40		30		20	20	10	NA
	060100
		3	70		70		70	70	70	70
	060120	2-1/2	10			NA	NA	NA	NA	NA
		3*	70		70		70	70	70	70
ALTITUDE (FT)	UNIT SIZE	VENT PIPE				NUMBER OF 90° ELBOWS
		DIAMETER (IN.)		1		2	3	4	5	6
	024040	1-1/2		67		62	57	52	52	47
	036040	2		70		70	70	70	70	70
	024060	1-1/2		17		12	7	NA	NA	NA
	036060
		2		70		67	66	61	61	61
	048060
2001 to 3000
	036080	2		49		44	30	25	25	15
	048080
		2-1/2		70		70	70	70	70	70
	060080
	048100	2-1/2		35		26	16	16	6	NA
	060100	3		70		70	70	70	66	61
	060120	3*		63		62	62	61	61	61
ALTITUDE (FT)	UNIT SIZE	VENT PIPE				NUMBER OF 90° ELBOWS
		DIAMETER (IN.)		1		2	3	4	5	6
	024040	1-1/2		64		59	54	49	48	43
	036040	2		70		70	70	70	70	70
	024060	1-1/2		16		11	6	NA	NA	NA
	036060
		2		68		63	62	57	57	56
	048060
3001 to 4000	036080	2		46		41	28	23	22	13
	048080
		2-1/2		70		70	70	70	70	70
	060080
	048100	2-1/2		33		24	15	14	5	NA
	060100	3		70		70	70	66	61	56
	060120	3*		59		59	58	57	57	56
ALTITUDE (FT)	UNIT SIZE	VENT PIPE				NUMBER OF 90° ELBOWS
		DIAMETER (IN.)		1		2	3	4	5	6
	024040	1-1/2		60		55	50	45	44	39
	036040	2		70		70	70	70	70	70
	024060	1-1/2		15		10	5	NA	NA	NA
	036060
		2		64		59	58	53	52	52
	048060
4001 to 5000²	036080	2		44		39	26	21	20	11
	048080
		2-1/2		70		70	70	70	70	70
	060080
	048100	2-1/2		31		22	13	12	NA	NA
	060100	3		70		70	67	62	57	52
	060120	3*		56		55	54	53	52	52

* Wide radius elbow.

²Vent sizing for Canadian installations over 4500 ft (1370 m) above sea level are subject to acceptance by the local authorities having jurisdiction. NAÐNot Allowed; pressure switch will not make.

NOTES:

1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.

2. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.

3. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.

4. The minimum pipe length is 5 ft for all applications.

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