Minimum Free Area Required; Minimum Space Volumes - International comfort products R9MSB0801716 Installation Instructions Manual

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INSTALLATION INSTRUCTIONS
Table 3 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors
TWO HORIZONTAL DUCTS
(1 SQ. IN./2,000 BTUH)
(1,100 SQ. MM/KW)
FURNACE
INPUT
Free Area of
(BTUH)
Opening and
Duct
Sq. In (Sq. mm)
30 (19355)
60,000
40 (25807)
80,000
50 (32258)
100,000
60 (38709)
120,000
FURNACE
WATER HEATER
100,000
+
30,000
60,000
+
40,000
80,000
+
30,000
Table 4 – Minimum Space Volumes for 100% Combustion, Ventilation and Dilution Air from Outdoors
OTHER THAN FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
30
ACH
1,050 (29.7)
0.60
1,260 (35.6)
0.50
1,575 (44.5)
0.40
2,100 (59.4)
0.30
3,150 (89.1)
0.20
6,300 (178.0)
0.10
NP
0.00
NP = Not Permitted
440 01 6001 05
SINGLE DUCT OR OPENING
Free Area of
Round Duct
Opening and
In. (mm) Dia
Sq. In (Sq. mm)
6 (152)
20 (13043)
7 (178)
27 (17391)
8 (203)
34 (21739)
9 (229)
40 (26087)
EXAMPLES: Determining Free Area
TOTAL INPUT
(130,000 divided by
=
4,000)
(100,000 divided by
=
3,000)
(110,000 divided by
=
2,000)
40
50
40
Space Volume Ft
1,400
1,750
1,400
(39.6)
(49.5)
(39.6)
1,680
2,100
1,680
(47.5)
(59.4)
(47.5)
2,100
2,625
2,100
(59.4)
(74.3)
(59.4)
2,800
3,500
2,800
(79.2)
(99.1)
(79.2)
4,200
5,250
4,200
(118.9)
(148.6)
(118.9)
8,400
10,500
8,400
(237.8)
(297.3)
(237.8)
NP
NP
NP
Specifications subject to change without notice.
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
Round Duct
Duct
In. (mm) Dia
5 (127)
6 (152)
7 (178)
7 (178)
= 32.5 Sq. In. for each two Vertical Ducts or Openings
= 33.3 Sq. In. for each Single Duct or Opening
= 55.0 Sq. In. for each two Horizontal Ducts
FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
60
80
3
3
(M
)
1,500
2,000
(42.5)
(56.6)
1,800
2,400
(51.0)
(67.9)
2,250
3,000
(63.7)
(84.9)
3,000
4,000
(84.9)
(113.2)
4,500
6,000
(127.3)
(169.8)
9,000
12,000
(254.6)
(339.5)
NP
NP
Gas Furnace: R9MSB
TWO OPENINGS OR
VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
Free Area of
Opening and
Round Duct
Duct
In. (mm) Dia.
Sq. In (mm)
15 (9678)
5 (127)
20 (12904)
5 (127)
25 (16130)
6 (152)
30 (19355)
6 (152)
100
120
140
2,500
3,000
3,500
(70.8)
(84.9)
(99.1)
3,000
3,600
4,200
(84.9)
(101.9)
(118.9)
3,750
4,500
5,250
(106.1)
(127.3)
(148.6)
5,000
6,000
7,000
(141.5)
(169.8)
(198.1)
7,500
9,000
10,500
(212.2)
(254.6)
(297.1)
15,000
18,000
21,000
(424.4)
(509.2)
(594.1)
NP
NP
NP
11

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