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24 | Installation
SB625WS/SB745WS6 720 805 218 (2016/02)
Polypropylene Venting (Model SB625WS Series Boilers only)
The Model SB625WS Series Boilers may utilize an exhaust vent installed
vertically through the roof or in a chimney chase. The configuration may
be up to a maximum of 100 equivalent feet of venting. One 87 or 45
degree elbow is equivalent to 5 or 2.5 feet of venting, respectively. The
chimney cap is equivalent to 3 feet of venting.
The following components may be employed:
For installation in Canada: In accordance with CSA B149.1 Natural Gas
and Propane Installation Code, vents constructed using plastic piping
shall be certified to ULC S636.
5.7 Code Required Vent Terminations
Horizontal Terminations:
Vent terminations should be at least 4 feet below, 1 foot above or 4
feet horizontally from any window, door or gravity air inlet of a
building.
The termination shall be at least 6 feet away from any other building
opening, gas utility meter, service regulator or the like.
The termination shall be at least 6 feet away from the combustion air
intake of any other appliance.
The bottom of the vent terminal should be at least 12 inches above
both finished grade and any snow accumulation point.
Vent should not terminate over public walkways or over an area
where condensate or vapor could create a nuisance or be detrimental
to the operation of regulators, meters and other equipment.
Discharges should not be in wind-blocked areas, corners, or directly
behind vegetation.
Vertical Terminations:
Roof penetrations should follow all appliance codes and the vent
manufacturer‘s instructions. The vent should never be installed at
less than the required clearances to combustible materials per UL,
NFPA and local codes. “Double-wall or thimble” assemblies are
required when penetrating combustible walls and roofs.
Vertical discharges should extend at least 2 feet above the roof
through properly flashed penetrations and at least 2 feet above
anything within a 10 foot horizontal diameter. Discharges that
extend more than 2 feet above the roof must be laterally supported.
If the vent systems is to be connected to an existing stack, the stack
must be UL Listed for Category II or IV appliances (capable of 240 °F,
positive pressure and condensing flue gas operation).
Masonry stacks must be lined and the vent penetration must
terminate flush with and be sealed to this liner. Vents may enter the
stack through the bottom or side.
SB Boiler vent systems must not be interconnected to any other
venting system; The SB Boiler is designed to maintain its own vent
system.
The exhaust vent must be pitched up toward the termination a
minimum of ¼ “ in. per foot of length. Condensate must flow back to
the boiler flue collector freely, without accumulating in the vent.
5.8 Combustion Air from outside the building
Two permanent openings method - If outside combustion air is
required, the room shall have two permanent louvered openings to the
outdoors. Each opening must have a minimum free area of 1 square inch
for each 4,000 Btu/hr of total input rating of all fuel burning equipment
in the space.
When the air is supplied to the room via ducts, two ducts must be used.
Vertical ducts and openings must have a minimum free area of 1 square
inch for each 4,000 Btuh of the total input rating of all fuel burning
equipment in the space. Horizontal ducts and openings must have a
minimum free area of 1 square inch for each 2,000 Btuh of the total
input rating of all fuel burning equipment in the space.
One permanent opening method - If outside combustion air is
required, the room shall have one permanent louvered openings to the
outdoors. The opening must communicate directly with the outdoors or
through a duct in either a vertical or horizontal arrangement. The
opening must have a minimum free area of 1 square inch for each 3,000
Btu/hr of total input rating of all fuel burning equipment in the space.
The free area of the openings must be taken into account restrictions
from the louvers and screens. The louver manufacturer should be
consulted for the percentage of free area available. When free area is not
known, metal louvers typically have 60-70% of free area, wooden
louvers have between 20-25% of free area. Louvers should be in a fixed
position or interlocked with equipment so that they open automatically
during equipment operation.The combustion air damper opening shall
be located as follows: top louver shall began within 12” of the ceiling and
the bottom louver within 12” of the floor as prescribed in NFPA 54.
Direct intake method - If outside combustion air is required, air may be
drawn from the outdoors via a duct connected directly to the burner
intake. The duct shall be constructed of galvanized steel or a material
having equivalent strength and rigidity. Refer to the burner
manufacturer's recommendations and installation instructions for
additional guidelines and application requirements.
SB625WS-160
SB625WS-220
SB625WS-290
SB625WS-370
SB625WS-480
SB625WS-640
Centrotherm
Innoflue SW -
Polypropylene
200 mm
(8 inch)
250 mm
(10 inch)
315 mm
(12 inch)
Straight Length
1
1. x = 1, 2, 3 or 6, which indicates the length in feet
ISVL08X ISVL10X ISVL12X
elbow
87 degree
ISEL0887 ISEL1087 ISEL1287
elbow
45 degree
ISEL0845 ISEL1045 ISEL1245
Vent Terminations
Chimney Cap ISCS08 ISCS10 ISCS12
Straight Gray
Roof terminal
ISEP086 ISEP106 ISEP126
Table 11 Polypropylene Venting
24


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