Duct Work Recommendations; Venting - Bryant 369AAN Installation, Start-Up, And Operating Instructions Manual

TABLE 4—COMBUSTION AIR
FROM UNCONFINED SPACE
369AAN FURNACE
INPUT BTUH
70,000
91,000
105,000
119,000
140,000
154,000
1. If combustion air is taken through a permanent opening
directly communicating with the outdoors, the opening shall
have a minimum free area of 1 sq in. per 4000 Btuh of total
input rating for all equipment in the enclosure.
2. If combustion air is taken from outdoors through vertical
ducts, the openings and ducts MUST have at least 1 sq in.
of free area per 4000 Btuh of the total input for all
equipment within the confined space. (See Table 5.)
TABLE 5—COMBUSTION AIR FROM OUTDOORS
THROUGH VERTICAL DUCTS
FREE AREA PER
369AAN FURNACE
INPUT BTUH
70,000
91,000
105,000
119,000
140,000
154,000
3. If combustion air is taken from outdoors through horizontal
ducts, the openings and ducts MUST have at least 1 sq in.
of free area per 2000 Btuh of the total input for all
equipment within the confined space. (See Table 6.)
TABLE 6—COMBUSTION AIR FROM OUTDOORS
THROUGH HORIZONTAL DUCTS
369AAN FURNACE FREE AREA PER OPENING
INPUT BTUH
70,000
91,000
105,000
119,000
140,000
154,000
When ducts are used to supply air, they must be of the same cross
sectional area as free area of openings to which they connect.
The minimum dimension of rectangular air ducts must not be less
than 3 in.
C. Duct Work Recommendations
WARNING: When supply ducts carry air circulated by
furnace to areas outside spaces containing furnace, return
air MUST also be handled by a duct sealed to furnace
casing and terminating outside space containing furnace.
Incorrect duct work termination and sealing will create a
hazardous condition which could lead to bodily harm.
FREE AREA PER
OPENING
(SQ IN.)
100
100
105
119
140
154
ROUND PIPE
OPENING
(IN. DIAM)
(SQ IN.)
17.5 5
22.8 6
26.3 6
29.8 6
35.0 6
38.5 6
ROUND PIPE
(SQ IN.) (IN. DIAM)
35.0 7
45.5 8
52.5 9
59.5 9
70.0 10
77.0 10
CAUTION: Return-air grilles and warm air registers
MUST NOT be obstructed. Failure to follow this caution
will result in premature failure of heat exchanger.
The proper sizing of warm air ducts is necessary to ensure
satisfactory furnace operation. Duct work should be in accordance
with the latest editions of NFPA-90A (Installation of Air Condi-
tioning and Ventilating Systems) and NFPA-90B (Warm Air
Heating and Air Conditioning Systems) or Canadian equivalent.
The supply duct work should be attached to flanged front opening
provided at discharge end of furnace. The return-air duct work
should be attached to flanged rear opening of furnace. See Fig. 2
for dimensions of these openings.
NOTE: The back (blower access opening) should not be used for
return air.
The following recommendations should be followed when install-
ing duct work:
1. Install locking-type dampers in all branches of individual
ducts to balance out system. Dampers should be adjusted to
impose proper static at outlet of furnace
2. A flexible duct connector of noncombustible material
should be installed at unit on both supply- and return-air
systems. In applications where extremely quiet operation is
necessary, the first 10 ft (if possible) of supply and return
ducts should be internally lined with acoustical material.
3. In cases where return-air grille is located close to fan inlet,
there should be at least one 90° air turn between fan inlet
and grille. Further reduction in sound level can be accom-
plished by installing acoustical air turning vanes or lining
duct as described in item 2 above.
4. When a single air grille is used, duct between grille and
furnace must be the same size as return opening in furnace.
D. Venting
Venting of furnace should be to the outside and in accordance with
local codes or requirements of local utility.
OIL-FIRED APPLIANCES SHALL BE CONNECTED TO
FLUES HAVING SUFFICIENT DRAFT AT ALL TIMES TO
ENSURE SAFE AND PROPER OPERATION OF APPLIANCE.
For additional venting information, refer to ANSI/NFPA 211
Chimney, Fireplaces, Vents, and Solid Fuel Burning Appliances
and/or CSA B139 Installation Code.
This furnace is certified for use with Type L vent (maximum flue
gas temperature 575°F).
VENT SYSTEM INSPECTION
Before furnace is installed, it is highly recommended that any
existing vent system be completely inspected.
For any chimney or vent, this should include the following:
1. Inspection for any deterioration in chimney or vent. If
deterioration is discovered, chimney must be repaired or
vent must be replaced.
2. Inspection to ascertain that vent system is clear and free of
obstructions. Any blockage must be cleared before install-
ing furnace.
3. Cleaning chimney or vent if previously used for venting a
solid fuel burning appliance or fireplace.
4. Confirming that all unused chimney or vent connections are
properly sealed.
5. Verification that chimney is properly lined and sized per the
applicable codes. (Refer to list of codes in Safety Consid-
erations section.)
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