Lennox International Inc ML193DF Maximum Allowable Intake or Exhaust Vent Length in Feet

TABLE 7

Maximum Allowable Intake or Exhaust Vent Length in Feet

*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

Standard Termination at Elevation 0 − 10,000 ft.

Number

Of 90°

Elbows

Used

	2" Pipe					2−1/2" Pipe					3" Pipe
		Model					Model					Model
045	070		090	110	045	070		090	110	045	070		090	110

1	61	46	24		100	80	43		127	127	108	108
2	56	41	19		95	75	38		122	122	103	103
3	51	36	14		90	70	33		117	117	98	98
4	46	31			85	65	28		112	112	93	93
5	41	26			80	60	23		107	107	88	88
				n/a				n/a
6	36	21			75	55	18		102	102	83	83
7	31	16	n/a		70	50	13		97	97	78	78
8	26	11			65	45			92	92	73	73
9	21				60	40	n/a		87	87	68	68
		n/a
10	16				55	35			82	82	63	63

Concentric Termination Elevation 0 − 10,000 ft.

Number

Of 90°

Elbows

Used

	2" Pipe					2−1/2" Pipe					3" Pipe
		Model					Model					Model
045	070		090	110	045	070		090	110	045	070		090	110

1	53	38	22		90	70	39		111	111	104	104
2	48	33	17		85	65	34		106	106	99	99
3	43	28	12		80	60	29		101	101	94	94
4	38	23			75	55	24		96	96	89	89
5	33	18			70	50	19		91	91	84	84
				n/a				n/a
6	28	13			65	45	14		86	86	79	79
7	23		n/a		60	40			81	81	74	74
8	18				55	35			76	76	69	69
		n/a					n/a
9	13				50	30			71	71	64	64
10	n/a				45	25			66	66	59	59

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