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1.
Adjoining rooms can be considered part of an unconfined
area if there are openings without doors between rooms.
2.
An attic or crawl space may be considered an unconfined
space provided there are adequate ventilation openings
directly to outdoors. Openings MUST remain open and
NOT have any means of being closed off. Ventilation
openings to outdoors MUST be at least 1" square (25mm 2)
of free area per 4,000 BTUH of total input rating for all gas
appliances in area.
3.
Install air intake a minimum of 12" (300mrn) above maxi-
mum snow level and clear of any obstruction. Duct or ven-
tilation opening requires one square inch of free area per
4,000 BTUH of total input rating for all gas appliances in
area.
4.
Air inlet MUST be screened with not less than
1/4"
(6mm)
mesh screen.
Unusually tight construction is defined as: Construction with
1.
Walls and ceilings exposed to the outside have a continu-
ous, sealed vapor barrier. Openings are gasketed or
sealed and
2.
Doors and openable windows are weather stripped and
3,
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.
VentilationAir
UnusuallyTight Construction
In unconfined spaces, infiltration may be adequate to provide air
for combustion, ventilation and dilution of flue gases. However, in
buildings with unusually tight construction, additional air MUST
be provided using the methods described in section titled Con-
fined Space Installation:
Some provincial codes and local municipalities require ventila-
tion or make-up air be brought into the conditioned space as re-
placement air. Whichever method is used, the mixed return air
temperature across the heat exchanger MUST not fall below
60°F (15° c) or flue gases will condense in the heat exchanger.
This will shorten the life of the heat exchanger and possibly void
your warranty.
4. Vent and CombustionAir Piping
Poison carbon monoxide gas, fire and explo-
sion hazard.
Read and follow all instructions in this section.
Failure to properly vent this furnace can result in
property damage, personal injury and/or death.
Dual Certified Furnace
This furnace is certified as a category IV appliance and is dual
certified as a direct vent fu mace using outsideair for combuslJon
or it can use air from inside the structure for combustion. The IN-
LET air pipe is optional. If combustionair comes from inside the
structure, adequate make up air MUST be provided to compen-
sate for oxygen burned. See Confined Space Installation in the
Combustion and Ventilation Air chapter, if combustion air is
drawn from outside the structure, it MUST be taken from the
same atmospheric pressure zone as the vent pipe,
ContaminatedCombustionAir
Installations in certain areas or types of sfructures will increase
the exposure to chemicals or Halogens which may harm the fur-
Race.
The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
evaluated carefully as it may be necessary to provide outside air
for combustion.
Commercial buildings.
Buildings with indoor pools.
Furnaces installed in laundry rooms.
Furnaces installed in hobby or craft rooms.
Furnaces installed near chemical storage areas.
Permanent wave solutions for hair.
Chlorinated waxes and cleaners.
Chlorine based swimming pool chemicals.
Water softening chemicals.
De-icing salts or chemicals.
Carbon tetrachloride.
Halogen type refrigerants.
Cleaning solvents (such as perchloroethylene).
Printing inks, paint removers, varnishes, etc..
Hydrochloric acid.
Sulfuric Acid.
Solvent cements and glues.
Antistatic fabric softeners for clothes dryers.
Masonry acid washing materials.
Vent and Combustion Air PipingGuidelines
1.
Determine the best routing and termination for the vent
pipe and air inlet pipe (when used) by referring to all of the
instructions and guidelines in Section 4.
2.
Determine the size required for the vent pipe and air inlet
pipe (when used).
3.
Loosely assemble all venting parts without
adhesive
(pipe joint cement) for correct fit before final assembly.
4.
Use of vertical piping is preferred because there will be
some moisture in the flue gases that may condense as it
leaves the vent pipe (See Special Instruction For Horizon-
tal Vents).
5.
The vent MUST exit the furnace at the top left side.
6.
The vertical vent pipe MUST be supported so that no
weight is allowed to rest on the combustionblower.
7.
Exhaust vent piping diameter MUST NOT be reduced.
8.
All exhaust vent piping from the furnace to termination
MUST slope upwards, away from furnace, a minimum of
1/4" per foot of run (6ram per 300mm).
9.
Use DWV type long radius elbows whenever possible, as
they provide for the minimum slope on horizontal runs and
they provide less resistance in the vent system. If DWV el-
bows cannot be used, use two, 45° elbows when possible.
On horizontal runs the elbows can be slightly misaligned to
provide the correct slope.
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