Bryant 589A, 588A user manual Ð Maximum Gas Flow Capacity, Ð Supply and Return Duct Openings, Ð17Ð

				Table 3 Ð Maximum Gas Flow Capacity*
NOMINAL	INTERNAL							LENGTH OF PIPE, FT²
IRON PIPE,
	DIAMETER
SIZE	(in.)	10	20		30	40	50	60	70	80	90	100	125	150	175	200
(in.)
1¤2	.622	175	120		97	82	73	66	61	57	53	50	44	40	Ð	Ð
3¤4	.824	360	250		200	170	151	138	125	118	110	103	93	84	77	72
1	1.049	680	465		375	320	285	260	240	220	205	195	175	160	145	135
11¤4	1.380	1400	950		770	600	580	530	490	460	430	400	360	325	300	280
11¤2	1.610	2100	1460		1180	990	900	810	750	690	650	620	550	500	460	430

*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-in. wg (based on a 0.60 speci®c gravity gas). Refer to Table C-4, National Fire Protection Association NFPA 54.

²This length includes an ordinary number of ®ttings.

SUPPLY DUCT OPENING RETURN DUCT OPENING

Fig. 16 Ð Supply and Return Duct Openings

Fig. 18 Ð Vertical Duct Cover Removed

Fig. 17 Ð Lance Location for Vertical Duct

Opening CoverFig. 19 Ð Removal of Vertical Discharge Opening Cover

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