INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
12 440 01 7104 02
Specifications subject to change without notice.
EXAMPLES: Determining Free Area
FURNACE WATER HEATER TOTAL INPUT
100,000 + 30,000 =
(130,000 divided by
4,000)
=
32.5 Sq. In. for each two Vertical Ducts or Open-
ings
60,000 + 40,000 =
(100,000 divided by
3,000)
= 33.3 Sq. In. for each Single Duct or Opening
80,000 + 30,000 =
(110,000 divided by
2,000)
= 55.0 Sq. In. for each two Horizontal Ducts
Table4–MinimumSpaceVolumesfor100% Combustion, Ventilation and Dilution Air from Outdoors
OTHER THAN FAN-ASSISTED TOTAL
(1,000’S BTUH GAS INPUT RATE)
FAN-ASSISTED TOTAL
(1,000’S BTUH GAS INPUT RATE)
ACH
30 40 50 40 60 80 100 120 140
Space Volume Ft
3
(M
3
)
0.60
1,050
(29.7)
1,400
(39.6)
1,750
(49.5)
1,400
(39.6)
1,500
(42.5)
2,000
(56.6)
2,500
(70.8)
3,000
(84.9)
3,500
(99.1)
0.50
1,260
(35.6)
1,680
(47.5)
2,100
(59.4)
1,680
(47.5)
1,800
(51.0)
2,400
(67.9)
3,000
(84.9)
3,600
(101.9)
4,200
(118.9)
0.40
1,575
(44.5)
2,100
(59.4)
2,625
(74.3)
2,100
(59.4)
2,250
(63.7)
3,000
(84.9)
3,750
(106.1)
4,500
(127.3)
5,250
(148.6)
0.30
2,100
(59.4)
2,800
(79.2)
3,500
(99.1)
2,800
(79.2)
3,000
(84.9)
4,000
(113.2)
5,000
(141.5)
6,000
(169.8)
7,000
(198.1)
0.20
3,150
(89.1)
4,200
(118.9)
5,250
(148.6)
4,200
(118.9)
4,500
(127.3)
6,000
(169.8)
7,500
(212.2)
9,000
(254.6)
10,500
(297.1)
0.10
6,300
(178.0)
8,400
(237.8)
10,500
(297.3)
8,400
(237.8)
9,000
(254.6)
12,000
(339.5)
15,000
(424.4)
18,000
(509.2)
21,000
(594.1)
0.00
NP NP NP NP NP NP NP NP NP
NP = Not Permitted
*Minimum dimensions of 3-in. (76mm)
NOTE Use any of the following combinations of openings:
A&B, C&D, D&E, F&G
L12F012
Figure 6 -- Air for Combustion, Ventilation, and Dilution for
Outdoors
* Minimum opening size is 100 sq in. (64516 sq. mm) with
minimum dimensions of 3-in. (76mm)
{ Minimum of 3-in. (76mm) when type-B1 vent is used.
L12F013
Figure 7 -- Air for Combustion, Ventilation, and Dilution
from Indoors
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