HP 422690 I manual Allowable Pipe Length feet

Table 2. Maximum Pipe Length --Non-Direct Vent

				ALLOWABLE PIPE LENGTH (feet)
ALTITUDE	FURNACE		PIPE		NUMBER OF SWEEP ELBOWS (SEE NOTE 1)
	INPUT		DIA.	1	2	3		4	5	6	7	8
	54,000	2"		112	108	104		100	96	92	88	84
	72,000	2"		55	51	47	43		39	35	31	27
	72,000	3"		150	150	150	150		150	150	150	150
0'-1000'	90,000	2"		36	32	28	24		20	16	-	-
	90,000	3"		150	150	150	145		140	135	130	125
	108,000	3"		85	80	75	70		65	60	55	50
	126,000	3"		62	57	52	47		42	37	32	27
	54,000	2"		97	93	90	86		83	80	76	73
	72,000	2"		44	40	36	33		30	26	23	19
	72,000	3"		150	150	150	150		150	150	150	150
1001'-2000'	90,000	2"		30	26	23	19		16	-	-	-
	90,000	3"		140	135	130	125		120	115	110	105
	108,000	3"		75	70	65	60		55	50	45	40
	126,000	3"		50	45	40	35		30	25	20	15
	54,000	2"		84	81	78	74		71	67	64	61
	72,000	2"		37	34	30	27		24	21	18	15
2001'-3000'	72,000	3"		150	150	150	150		150	150	150	150
	90,000	2"		24	21	18	14		11	-	-	-
	90,000	3"		125	120	115	110		105	100	95	90
	108,000	3"		50	45	40	35		30	25	20	15
	126,000	3"		40	35	30	25		20	15	-	-
	54,000	2"		71	68	64	61		58	55	51	48
	72,000	2"		30	27	23	20		17	13
	72,000	3"		150	150	150	150		150	150	150	150
3001'-4000'	90,000	2"		19	16	12	-		-	-	-	-
	90,000	3"		100	95	90	85		80	75	70	65
	108,000	3"		37	32	27	22		17	12	-	-
	126,000	3"		30	25	20	15		10	-	-	-
	126,000		3"	62	57	52		47	42	37	32	27	See Note 2
	54,000	2"		57	54	50		47	44	40	36	33
	72,000	2"		25	22	19	16		12	-	-	-
4001'-5000'	72,000	3"		150	150	150	150		150	150	150	150
	90,000	3"		85	80	75	70		65	60	55	50
	108,000		3"	85	80	75		70	65	60	55	50	See Note 2
	126,000		3"	62	57	52		47	42	37	32	27
	54,000	2"		43	40	37		33	30	27	24	20
	72,000	2"		21	18	14	11		-	-	-	-
5001'-6000'	72,000	3"		150	150	150	150		150	150	150	150
	90,000	3"		70	65	60	55		50	45	40	35
	108,000		3"	85	80	75		70	65	60	55	50	See Note 2
	126,000		3"	62	57	52		47	42	37	32	27
	54,000		2"	110	106	104		100	96	92	88	84
	72,000		2"	50	46	43		40	36	32	29	25
6001'-7000'	72,000		3"	150	150	150		150	150	150	150	150	See Note 2
	90,000		3"	150	150	150		145	140	135	130	125
	108,000		3"	85	80	75		70	65	60	55	50
	126,000		3"	62	57	52		47	42	37	32	27
	54,000		2"	97	93	90		86	83	80	76	73
	72,000		2"	50	46	43		40	36	32	29	25
7001'-8000'	72,000		3"	150	150	150		150	150	150	150	150	See Note 2
	90,000		3"	150	150	150		145	140	135	130	125
	108,000		3"	85	80	75		70	65	60	55	50
	126,000		3"	60	55	50		45	40	35	30	25
	54,000		2"	84	81	78		74	71	67	64	61
	72,000		2"	41	38	34		31	28	24	21	17
8001'-9000'	72,000		3"	150	150	150		150	150	150	150	150	See Note 2
	90,000		3"	150	150	150		145	140	135	130	125
	108,000		3"	70	65	60		55	50	45	40	35
	126,000		3"	45	40	35		30	25	20	15
	54,000		2"	71	68	64		61	58	55	51	48
	72,000		2"	35	31	28		25	21	18	15	-
9001'-10000'	72,000		3"	150	150	150		150	150	150	150	150	See Note 2
	90,000		3"	150	150	150		145	140	135	130	125
	108,000		3"	55	50	45		40	35	30	25	20
	126,000		3"	35	30	25		20	15	10	-	-

NOTE 1: The table assumes the use of sweep elbows. If using hard 90? elbows, the vent length should be decreased an additional 3 feet for every elbow used.

NOTE 2: The shaded portions of the table require the high altitude pressure switch in order to operate the furnace at the listed vent lengths.

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