HP 422690 I DIA, PIPE, INPUT, FURNACE, ALTITUDE, (SEE NOTE 1), NUMBER OF SWEEP ELBOWS (each pipe), ALLOWABLE PIPE LENGTH (feet of each pipe)

Table 1. Maximum Pipe Length--Direct Vent

			ALLOWABLE PIPE LENGTH (feet of each pipe)
ALTITUDE	FURNACE		PIPE	NUMBER OF SWEEP ELBOWS (each pipe)						(SEE NOTE 1)
	INPUT		DIA.	1	2	3	4	5	6		7	8
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		40	40	37	33	30	27		23	20
	72,000	3"		40	40	40	40	40	40		40	40
0'-1000'	90,000	2"		30	26	22	19	15	11		-	-
	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	40	40	40	40	40		40	40
	126,000	3"		40	40	40	40	35	30		25	20
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		40	37	33	29	25	21		19	15
	72,000	3"		40	40	40	40	40	40		40	40
1001'-2000'	90,000	2"		25	22	19	16	12	-		-	-
	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	40	40	40	40	40		40	40
	126,000	3"		40	38	33	28	22	16		11	-
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		35	33	29	25	21	17		13	-
2001'-3000'	72,000	3"		40	40	40	40	40	40		40	40
	90,000	2"		22	19	16	14	-	-		-	-
	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	40	40	40	40	40		40	40
	126,000	3"		35	30	25	20	15	10		-	-
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		30	28	26	24	22	20		18	17
	72,000	3"		40	40	40	40	40	40		40	40
3001'-4000'	90,000	2"		15	13	11	-	-	-		-	-
	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	40	40	40	40	40		40	40
	126,000	3"		30	25	20	15	10	-		-	-
	126,000		3"	40	40	40	40	35	30		25	20	See Note 2 below.
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		26	22	17	14	12	-		-	-
4001'-5000'	72,000	3"		40	40	40	40	40	40		40	40
	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	40	40	35	30	25		20	15
	108,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	126,000		3"	40	40	40	40	35	30		25	20
	54,000	2"		40	40	40	40	40	40		40	40
	72,000	2"		21	18	14	11	-	-		-	-
	72,000	3"		40	40	40	40	40	40		40	40
5001'-6000'	90,000	3"		40	40	40	40	40	40		40	40
	108,000	3"		40	35	30	25	20	15		10	-
	108,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	126,000		3"	40	40	40	40	35	30		25	20
	54,000		2"	40	40	40	40	40	40		40	40
	72,000		2"	40	40	40	40	36	32		28	24
	72,000		3"	40	40	40	40	40	40		40	40
6001'-7000'	90,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	108,000		3"	40	40	40	40	40	40		40	40
	126,000		3"	40	40	40	40	35	30		25	20
	54,000		2"	40	40	40	40	40	40		40	40
	72,000		2"	40	40	40	37	35	32		28	24
	72,000		3"	40	40	40	40	40	40		40	40
7001'-8000'	90,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	108,000		3"	40	40	40	40	40	40		40	40
	126,000		3"	40	40	40	40	35	30		25	20
	54,000		2"	40	40	40	40	40	40		40	40
	72,000		2"	40	40	37	34	31	28		24	21
	72,000		3"	40	40	40	40	40	40		40	40
8001'-9000'	90,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	108,000		3"	40	40	40	40	40	40		40	40
	126,000		3"	40	40	40	35	30	25		20	15
	54,000		2"	40	40	40	40	40	40		40	40
	72,000		2"	40	37	35	31	27	24		21	18
	72,000		3"	40	40	40	40	40	40		40	40
9001'-10000'	90,000		3"	40	40	40	40	40	40		40	40	See Note 2 below.
	108,000		3"	40	40	40	40	40	40		40	40
	126,000		3"	40	35	30	25	20	15		-	-

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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