Bryant 340AAV Installation, Start-Up, And Operating Instructions Manual page 20

DUCTS
TO
O UTDOORS
12 " MAX
(305mm)
1 SQ IN.
PER 2000 B
BTUH*
DUCT S
TO
OUTDOORS
1 SQ IN.
PER 2000
A
BTUH*
12 " MAX
(305mm)
CIRCULA TING AIR DUCT S
*Minimum dimensions of 3 in. (76 mm).
NOTE: Use any of the following combinations of openings:
A & B C & D D & E F & G
Fig. 18 - - Air for Combustion, Ventilation, and Dilution
for Outdoors
If:
I =combined input of all other than fan-assisted appliances
other
in Btu/hr
I =combined input of all fan-assisted appliances in Btu/hr
fan
ACH = air changes per hour (ACH shall not exceed 0.60.)
The following requirements apply to the Standard Method and to
the Known Air Infiltration Rate Method.
1. Adjoining rooms can be considered part of a space if:
a. There are no closable doors between rooms.
b. Combining spaces on same floor level. Each opening
shall have free area of at least 1-in.
2
(2,000 mm /kW) of the total input rating of all gas
appliances in the space, but not less than 100-in.
2
(0.06 m ). One opening shall commence within 12 in.
(305 mm) of the ceiling and the second opening shall
commence within 12-in. (305 mm) of the floor. The
minimum dimension of air openings shall be at least
3-in. (76 mm). (See Fig. 19.)
c. Combining space on different floor levels. The
volumes of spaces on different floor levels shall be
considered as communicating spaces if connected by
one or more permanent openings in doors or floors
having free area of at least 2 in.
2
(4,400 mm /kW) of total input rating of all
gas appliances.
2. An attic or crawlspace may be considered a space that
freely communicates with the outdoors provided there are
adequate permanent ventilation openings directly to
outdoors having free area of at least 1-in.
total input rating for all gas appliances in the space.
1 SQ IN.
PER 4000
BTUH*
12 "
D
(305mm)
MAX
VENT
THR OUGH
F
R OOF
1 SQ IN .
PER
4000
BTUH*
1 SQ IN .
PER
4000
BTUH*
E
G
12 "
(305mm)
MAX
C
12 " MAX
(305mm)
DUCT
1 SQ IN.
TO
PER 4000
OUTDOORS
BTUH*
A03174
2
/1,000 Btuh
2
2
/1,000 Btuh
2
/4,000 Btuh of
CIRCULATING AIR
DUCTS
INTERIOR
HEATED
SPACE
CIRCULATING AIR DUCTS
* Minimum opening size is 100 sq in. with minimum dimensions of 3 in. (76
mm)
† Minimum of 3 in. (76 mm) when type-B1 vent is used.
Fig. 19 - - Air for Combustion, Ventilation, and Dilution
3. In spaces that use the Indoor Combustion Air Method,
infiltration should be adequate to provide air for
combustion, permanent ventilation and dilution of flue
gases. However, in buildings with unusually tight
construction, additional air MUST be provided using
the methods described in the Outdoor Combustion Air
Method section.
Unusually tight construction is defined as
Construction with:
a. Walls and ceilings exposed to the outdoors have a
continuous, sealed vapor barrier. Openings are
gasketed or sealed and
b. Doors and openable windows are weatherstripped and
c. Other openings are caulked or sealed. These include
joints around window and door frames, between sole
plates and floors, between wall-ceiling joints, between
wall panels, at penetrations for plumbing, electrical
and gas lines, etc.
NOTE: In determining the free area of an opening, the blocking
effect of the louvers, grilles, and screens must be considered. If
the free area of a louver or grille design is unknown, it may be
assumed that wood louvers have a 20 percent free area, and metal
louvers or grilles have a 60 percent free area. Screens, when used,
must not be smaller than 1/4-in. (6 mm) mesh. Louvers and
grilles must be constructed so they cannot be closed.
When combustion air ducts are used, they must be of the same
cross sectional area as the free area of the openings to which they
connect. The minimum dimension of ducts must not be less than
3-in. (76 mm).
- - 20 - -
VENT THROUGH ROOF
12" MAX (305mm)
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
UNCONFINED
SPACE
6" MIN (152mm)
(FRONT)
Ü
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
12" MA X
(305mm)
from Indoors
A03175