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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)
30
40
50
44
66
88
110
132
154
ACH
Space Volume Ft3 (M3)
1,050
1,400
1,750
1,100
1,650
2,200
2,750
3,300
3,850
0.60
(29.7)
(39.6)
(49.5)
(31.1)
(46.7)
(62.2)
(77.8)
(93.4)
(109.0)
1,260
1,680
2,100
1,320
1,980
2,640
3,300
3,960
4,620
0.50
(35.6)
(47.5)
(59.4)
(37.3)
(56.0)
(74.7)
(93.4)
(112.1 )
(130.8)
1,575
2,100
2,625
1,650
2,475
3,300
4,125
4,950
5,775
0.40
(44.5)
(59.4)
(74.3)
(46.7)
(70.0)
(93.4)
(116.8)
(140.1 )
(163.5)
2,100
2,800
3,500
2,200
3,300
4,400
5,500
6,600
7,700
0.30
(59.4)
(79.2)
(99.1)
(62.2)
(93.4)
(124.5)
(155.7)
(186.8)
(218.0)
3,150
4,200
5,250
3,300
4,950
6,600
8,250
9,900
11,550
0.20
(89.1)
(118.9)
(148.6)
(93.4)
(140.1 )
(186.8)
(233.6)
(280.3)
(327.0)
6,300
8,400
10,500
6,600
9,900
13,200
16,500
19,800
23,100
0.10
(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
Figure
7 -- Air for Combustion,
Ventilation,
and Dilution
for Outdoors
TO
OUTDOORS
SQ IN.
PER 4000
BTUH*
(305mm)
12" MAX
1 SQ IN.
PER 2000
BTUH*
DUCTS
TO
OUTDOORS
1 SQ IN.
PER 2000
BTUH*
(305mm)
12_X
(305mm)
1 SQ IN.
PER
4000
BTUH*
O3
rr
O
O
a
F-
O
1 SQ IN.
PER
4000
BTUH*
12"
(305mm)
MAX
CIRCULATING
AIR DUCTS
(305mm)
1 SQ IN.
TO
PER 4000
OUTDOORS
BTUH*
*Minimum
dimensions
of 3-in.
(76 mm).
NOTE: Use any of the following combinations of openings:
A&BC&DD&EF&G
A03174
The Standard
Method:
1. The space
has no less volume
than
50 cu/ft, per 1,000
Btuh
of the maximum
input ratings
for
all gas
appli-
ances
installed
in the space
and
2. The air infiltration rate is not known
to be less than 0.40
air changes
per hour (ACH).
The Known
Air Infiltration
Rate Method
shall
be used,
if the
infiltration
rate is known
to be:
1. Less than
0.40 ACH and
2. Equal to or greater
than 0.10 ACH
Infiltration
rates greater
than
0.60 ACH shall
not be used. The
minimum
required
volume
of the
space
varies
with
the
number
of ACH
and
shall
be determined
per Table
3 or
Equations
1 and 2. Determine
the minimum
required
volume
for
each
appliance
in the
space
and
add
the
volumes
together
to get the total
minimum
required
volume
for the
space.
Figure 8 - Air for Combustion, Ventilation,
and Dilution
from Indoors
I
I
INTERIOR
HEATED
SPACE
CIRCULATING
AIR DUCTS
VENT THROUGH
ROOF
I
12"
AX(305mm)
z
O
2_
1 SQ IN.
i
PER 1000
BTUH*
IN DOOR
OR WALL
UNCONFINED
W
SPACE
-4,
_:
6" MIN (152mm)
co
(FRONT)0
_z
1 SQ IN.
PER 1000
_
BTUH*
IN DOOR
OR WALL
L 12" MAX (305ram)
Minimum
opening
size is 100 sq in. (64516
sq. mm)with
minimum
dimensions
of
in. (76 ram)
Minimum
of 3 in. (76 mm) when
type-B1
vent is used.
A03t 75
Table
3 -
Minimum
Space
Volumes
were
determined
by
using
the
following
equations
from
the
National
Fuel
Gas
Code
ANSI
7223.1-2009/NFPA
54-2009,
9.3.2.2:
1. For other
than
fan-assisted
appliances,
such
as a
draft hood-equipped
water
heater:
Vo'" m e Other: A-A0_ _k,T 0 00 "a_/h r"#
A04002
2. For fan-assisted
appliances
such as this furnace:
15ft3 f[
]fan
="_
V°lumeFan
= ACH
_000
Btu/hrJ
A04003
441 01 1402 02
9
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