The Standard Method; Combination Of Indoor And Outdoor Air - Carrier 58TP0A Installation, Start-Up, Operating And Service And Maintenance Instructions

The opening shall commence within 12 in. (300 mm) of the
ceiling. Appliances in the space shall have clearances of at least 1
in. (25 mm) from the sides and back and 6 in. (150 mm) from the
front. The opening shall directly communicate with the outdoors
or shall communicate through a vertical or horizontal duct to the
outdoors or spaces (crawl or attic) that freely communicate with
the outdoors.
Indoor Combustion AirE NFPA & AGA
Standard and Known- -Air- -Infiltration Rate Methods
Indoor air is permitted for combustion, ventilation, and dilution,
if the Standard or Known- -Air- -Infiltration Method is used.
Table 1 – Minimum Free Area Required for Each Combustion Air opening of Duct to Outdoors
TWO HORIZONTAL DUCTS
FURNACE (1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW)
INPUT
Free Area of Opening
(BTUH)
and Duct
Sq. In. (Sq. mm)
44,000 22 (14194)
66,000 33 (21290)
88,000 44 (28387)
110,000 55 (35484)
132,000 66 (42580)
154,000 77 (49677)
Note: Not all models have these sizes.
FURNACE WATER HEATER
110,000 + 30,000
66,000 + 40,000
88,000 + 30,000
Table 2 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
30
ACH
1,050 1,400
0.60
(29.7) (39.6)
1,260 1,680
0.50
(35.6) (47.5)
1,575 2,100
0.40
(44.5) (59.4)
2,100 2,800
0.30
(59.4) (79.2)
3,150 4,200
0.20
(89.1) (118.9)
6,300 8,400
0.10
(178.3) (237.8)
0.00
NP
NP = Not Permitted
Note: Not all models have these sizes.
2. Fig. 7 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and
ventilation air opening, to the outdoors.
a. One opening MUST commence within 12 in. (300
mm) of the ceiling and the second opening MUST
commence within 12 in. (300 mm) of the floor.
b. Size openings and ducts per Fig. 7 and Table 1.
c. TWO HORIZONTAL DUCTS require 1 sq. in. (645
sq. mm) of free area per 2,000 Btuh (1,100 mm
of combined input for all gas appliances in the space
per Fig. 7 and Table 1.
SINGLE DUCT OR OPENING
(1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW)
Round Duct Free Area of Opening
Dia. and Duct
In. (mm) Sq. In. (Sq. mm)
6 (152) 14.7 (9484)
7 (178) 22 (14193)
8 (203) 29.3 (18903)
9 (229) 36.7 (23677)
10 (254) 44 (28387)
10 (254) 51.3 (33096)
EXAMPLES: Determining Free Area
TOTAL INPUT
= (140,000 divided by 4,000)
= (106,000 divided by 3,000)
= (118,000 divided by 2,000)
40 50 44
1,750 1,100
(49.5) (31.1)
2,100 1,320
(59.4) (37.3)
2,625 1,650
(74.3) (46.7)
3,500 2,200
(99.1) (62.2)
3,300
5,250 (148.6)
(93.4)
10,500 6,600
(297.3) (186.8)
NP NP NP
2
/kW)
sandium.com
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
Many homes require air to be supplied from outdoors
for furnace combustion, ventilation, and dilution of flue
gases.
The furnace combustion air supply must be provided in
accordance with this instruction manual.
Round Duct
Dia.
In. (mm)
5 (127)
6 (152)
7 (178)
7 (178)
8 (203)
9 (229)
= 35.0 Sq. In. for each two Vertical Ducts or Openings
= 35.3 Sq. In. for a Single Duct or Opening
= 59.0 Sq. In. for each of two Horizontal Ducts
FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
66 88
3 3
Space Volume Ft (M )
1,650 2,200
(46.7) (62.2)
1,980 2,640
(56.0) (74.7)
2,475 3,300
(70.0) (93.4)
3,300 4,400
(93.4) (124.5)
4,950 6,600
(140.1) (186.8)
9,900 13,200
(280.3) (373.7)
NP NP
d. TWO OPENINGS OR VERTICAL DUCTS require 1
sq. in. (645 sq. mm) of free area per 4,000 Btuh (550
2
mm /kW) for combined input of all gas appliances in
the space per Fig. 7 and Table 1.
3. ONE OUTDOOR OPENING requires:
a. 1 sq. in. (645 sq. mm) of free area per 3,000 Btuh
2
(734 mm /kW) for combined input of all gas appli-
ances in the space per Table 1 and
b. Not less than the sum of the areas of all vent connect-
ors in the space.
8
TWO OPENINGS OR VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)
Free Area of Opening Round Duct
and Duct Dia.
Sq. In. (Sq. mm) In. (mm)
11 (7096) 4 (102)
16.5 (10645) 5 (127)
22 (14193) 6 (152)
27.5 (17742) 6 (152)
33 (21290) 7 (178)
38.5 (24839) 8 (203)
110 132 154
2,750 3,300 3,850
(77.8) (93.4) (109.0)
3,300 3,960 4,620
(93.4) (112.1) (130.8)
4,125 4,950 5,775
(116.8) (140.1) (163.5)
5,500 6,600 7,700
(155.7) (186.8) (218.0)
8,250 9,900 11,550
(233.6) (280.3) (327.0)
16,500 19,800 23,100
(467.2) (560.6) (654.1)
NP NP NP