Bryant 315AAV instruction manual Air For Combustion And Ventilation, Furnace Corrosion Hazard

315AAV

Table 2 – Minimum Free Area Required for Each Combustion Air opening of Duct to Outdoors

	TWO HORIZONTAL DUCTS		SINGLE DUCT OR OPENING		TWO OPENINGS OR VERTICAL DUCTS
FURNACE
	(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW)		(1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW)		(1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)
INPUT
	Free Area of Opening	Round Duct	Free Area of Opening	Round Duct	Free Area of Opening	Round Duct
(BTUH)	and Duct	Dia.	and Duct	Dia.	and Duct	Dia.
	Sq. In. (Sq. mm)	In. (mm)	Sq. In. (Sq. mm)	In. (mm)	Sq. In. (Sq. mm)	In. (mm)
44,000	22 (14194)	6 (152)	14.7 (9484)	5 (127)	11 (7096)	4 (102)
66,000	33 (21290)	7 (178)	22 (14193)	6 (152)	16.5 (10645)	5 (127)
88,000	44 (28387)	8 (203)	29.3 (18903)	7 (178)	22 (14193)	6 (152)
110,000	55 (35484)	9 (229)	36.7 (23677)	7 (178)	27.5 (17742)	6 (152)
132,000	66 (42580)	10 (254)	44 (28387)	8 (203)	33 (21290)	7 (178)
154,000	77 (49677)	10 (254)	51.3 (33096)	9 (229)	38.5 (24839)	8 (203)

EXAMPLES: Determining Free Area

FURNACE		WATER HEATER		TOTAL INPUT
110,000	+	30,000	= (140,000 divided by 4,000)		=	35.0	Sq. In. for each two Vertical Ducts or Openings
66,000	+	40,000	=	(106,000 divided by 3,000)	=	35.3	Sq. In. for a Single Duct or Opening
88,000	+	30,000	=	(118,000 divided by 2,000)	=	59.0	Sq. In. for each of two Horizontal Ducts

Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors

OTHER THAN FAN-ASSISTED TOTAL							FAN-ASSISTED TOTAL
	(1,000’S BTUH GAS INPUT RATE)					(1,000’S BTUH GAS INPUT RATE)
ACH		30	40	50	44	66	88	110	132	154
					Space Volume Ft3 (M3)
0.60		1,050	1,400	1,750	1,100	1,650	2,200	2,750	3,300	3,850
		(29.7)	(39.6)	(49.5)	(31.1)	(46.7)	(62.2)	(77.8)	(93.4)	(109.0)
0.50		1,260	1,680	2,100	1,320	1,980	2,640	3,300	3,960	4,620
		(35.6)	(47.5)	(59.4)	(37.3)	(56.0)	(74.7)	(93.4)	(112.1)	(130.8)
0.40		1,575	2,100	2,625	1,650	2,475	3,300	4,125	4,950	5,775
		(44.5)	(59.4)	(74.3)	(46.7)	(70.0)	(93.4)	(116.8)	(140.1)	(163.5)
0.30		2,100	2,800	3,500	2,200	3,300	4,400	5,500	6,600	7,700
		(59.4)	(79.2)	(99.1)	(62.2)	(93.4)	(124.5)	(155.7)	(186.8)	(218.0)
0.20		3,150	4,200	5,250 (148.6)	3,300	4,950	6,600	8,250	9,900	11,550
		(89.1)	(118.9)		(93.4)	(140.1)	(186.8)	(233.6)	(280.3)	(327.0)
0.10		6,300	8,400	10,500	6,600	9,900	13,200	16,500	19,800	23,100
		(178.3)	(237.8)	(297.3)	(186.8)	(280.3)	(373.7)	(467.2)	(560.6)	(654.1)
0.00		NP	NP	NP	NP	NP	NP	NP	NP	NP

NP = Not Permitted

AIR FOR COMBUSTION AND

VENTILATION

Provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:

SU.S. Installations: Section 9.3 of the NFPA 54/ANSI Z223.1-2009 , Air for Combustion and Ventilation and applicable provisions of the local building codes.

!CAUTION

FURNACE CORROSION HAZARD

Failure to follow this caution may result in furnace damage.

Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products.

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

The operation of exhaust fans, kitchen ventilation fans, clothes dryers, attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE CONDITION at the furnace. Make-up air MUST be provided for the ventilation devices, in addition to that required by the furnace. Refer to the Carbon Monoxide Poisoning Hazard warning in the venting section of these instructions to determine if an adequate amount of make-up air is available.

The requirements for combustion and ventilation air depend upon whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1,000 Btuh input rating for all gas appliances installed in the space.

SSpaces having less than 50 cubic feet per 1,000 Btuh require the OUTDOOR COMBUSTION AIR METHOD.

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