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svf
series
500/600
Venting and Combustion Air — General
Code Compliance
Venting and combustion air piping installations
must provide provisions in accordance with "Air for
Combustion and Ventilation," of the National Fuel Gas
Code – ANSI Z223 1/NFPA 54, latest edition, or sections
8 2-8 4 of the Natural Gas and Propane Installation Code
– CAN/CSA B149 1, and applicable local building codes
DANGER
!
DO NOT common vent boilers with other boilers
or appliances. Each boiler must have its own vent.
Inspect finished vent and air piping thoroughly to
ensure all are airtight and comply with instructions
in this manual and applicable codes. Verify that
all air openings are correctly sized, unobstructed,
and free of airborne contaminants. Failure to
provide a properly installed vent and air system
will result in severe personal injury or death.
WARNING
!
Do not cover nonmetallic vent pipe with thermal
insulation. Failure to comply can result in severe
personal injury, death, or substantial property
damage.
WARNING
!
Provide a vent manufacturer's bird screen at each
termination. Purchase bird screens from the vent
or air piping supplier. Failure to comply can result
in severe personal injury, death, or substantial
property damage.
WARNING
!
Use sweep elbows for all vent and air piping. DO
NOT use short-radius elbows for vent or air piping.
Failure to comply can result in severe personal
injury, death, or substantial property damage.
Venting Methods
There are two venting methods available Follow the
instructions on the following pages for the method used
Method 1: Direct Exhaust
Combustion air is taken from the inside Air piping is
not connected to the air inlet
Combustion air must be supplied through openings
550-100-273/0523
boiler manual
1
into the boiler room Follow the instructions in
this manual and comply with all applicable codes
Combustion air must not be exposed to any of the
contaminants listed in Table 7, page 28 Ensure
the air and boiler will not contain contaminated air
Where the SVF boiler shares a space with other
appliances, the combustion air openings must be
sized to handle the combined requirements of all
appliances in the space
Method 2: Direct Vent
Combustion air is piped to the boiler from the outside
Follow the instructions in this manual and comply
with all applicable codes Ensure the air inlet is not
likely to draw in contaminated air Do not terminate
air piping in locations that can allow contamination of
combustion air Refer to Table 7, page 28 for a list
of contaminants and sources
Combustion air can be piped individually for each
boiler, or it can be manifolded as shown in Figure
25, page 38 Combustion and ventilation openings
may also be required in boiler room walls per
instructions in this manual and applicable codes
Vent and Air Piping
Use only the materials listed in this manual for vent
and air pipe and fittings. Refer to page 31 for
information and hazards See Figure 22, page 34
for maximum lengths and reductions required for
fittings.
Boiler Categories
The SVF boilers are approved for Category II and
Category IV ratings The following pages of this
manual will specify which category applies to the
venting information given
Category II: The boiler is setup with a negative
pressure vent and is likely to condense in the vent
This category requires a direct exhaust venting
method
Category IV: The boiler is setup with a positive
pressure vent and is likely to condense in the vent
This category can use either direct exhaust or direct
vent methods
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