27
- Horizontal between air-inlet and exhaust vent: The horizontal
distance between the inlet and exhaust must be a minimum of
4” [102 mm] center to center.
- Wall Flashing: Under normal operating conditions this boiler
will produce a plume of white gases, and should be taken into
consideration when selecting an adequate location. A stainless,
plastic, or vinyl shield can be used to flash the exterior of the
residence.
- Flue Gas Hazard: Position the vent termination where vapors
cannot make accidental contact with people and pets or damage
nearby shrubs and plants.
- Elbow Extensions: Elbows on outside of wall must be no more
than ½ in. away from the wall.
- Vent Sloping: All indoor exhaust piping must be on a slope back
to the boiler a minimum of ¼ in. per linear foot (21 mm/m) of
vent. For applications where excessive condensation is possible
½ in. per linear foot (42 mm/m) is recommended. The venting
system shall be installed so as to prevent accumulation of
condensate and, where necessary, have means provided for
drainage of condensate.
- Vent screens:
It is recommended to install a vent screen or
vent termination approved by the vent manufacturer as the last
venting component of the vent system (both inlet and exhaust
vent) to prevent undesired objects (ie. birds, rodents, debris)
from entering the vent system.
- Vent Supports: Where required Vent and Air-inlet piping shall be
secured to the wall for more rigidity. All interior vent pipe shall
have a minimum support distance given per vent manufacturer’s
instructions. In the absence of such instructions than a minimum
support distance of 36” (914 mm) shall be maintained. The vent
and air-inlet piping shall be supported at every connection. The
vent and air-inlet piping shall be supported at every fitting.
Horizontal portions of the venting shall be supported to prevent
sagging.
9
WARNING:
Failure to provide adequate support may result in
substantial property damage, severe personal inju
ry or death.
NOTE:
the framing in wa
lls and roofs that the vent will penetrate
through shall be constructed to provide for support and
attachment of termination assemblies.
- Roof Exhaust: In all roof applications the discharge must point
away from the pitch of the roof.
- Roof Flashing: Install adequate flashing where the pipe enters
the roof, to prevent water leakage.
- Rain Cap:
Install and sea
l a rain cap over existing chimney
openings, in vacant chimney applications.
- Venting Below Grade: For installations that exit the wall below
grade refer to figure below.
Air-inlet
Exhaust
Wall Brackets
For installations that exit the wall below grade:
1. Excavate site to a point below where the pipes are to exit as
shown.
2. Ensure the wall is fully sealed where the pipes penetrate.
3. The Vent/Air-inlet piping MUST be secured to the side of the
building above grade, as shown, to provide rigidity.
4. Only use wall brackets approved for outdoor use and by the vent
manufactur
er for securing the air-inlet and vent exhaust pipes to
the wall.
9
WARNING:
Failure to properly support the air-inlet and vent
may result in substantial property damage, severe personal
injury or death.
5. Ensure that the Vent/Air-inlet clearances are maintained, see
Section 5.0 for details.
9
WARNING:
Failure to properly support the air-inlet and vent
may result in substantial property damage, severe personal
injury or death.
9
WARNING:
Condensate Hazard: Do not locate vent
over
public walkways, driveways or parking lots. Condensate could
drip and freeze resulting in a slip hazard or damage to vehicles
and machinery.
- Wall Thickness: Direct vent terminations are designed to work
with any standard wall thickness. Installation guidelines for min/
max wall thickness are as follows: Min. = 1 in., Max. = 36 in.
- Plastic Venting: Plastic venting systems shall not pass through
rated fire separations.
- Metal Venting Systems: Except for installation in single-and two-
family dwellings, metal venting systems which extend through
any storey above that on which the connected appliance
is located are to be provided with enclosures having a fire
resistance rating equal to or greater than that of the floor or roof
assemblies through which they pass.
9
WARNING
:
Insulation shall not be used on plastic pipes
.
9
WARNING
:
Insulation or other materials shall not be within
the required clearance spaces surrounding the vent unless
specified in the vent manufacturer’s installation instructions
.
9
Venting Options:
Due to potential moisture build-up along
the exterior wall or overhangs, the location of sidewall venting
must be carefully selected.
9
WARNING
:
Extra precaution must be taken to adequately
support the weight of the Vent/Air-inlet piping in applications
using roof-top terminations. Failure to follow these instructions
may result in venting or boiler component failure resulting in
flue gas spillage leading to property damage, serious injury or
death.
Vent piping outside the building
Supports every
24 in. [610 mm]
Exhaust
Vent
Air-Inlet
12 in. [305 mm] plus snow
allowance above grade
Maximum of 7 ft.
[2 m] is permitted
for piping outside a
building.
9
WARNING:
Failure to follow the instructions below may result
in substantial property damage, severe personal injury or
death.
Vent piping outside the building is permitted under the following
conditions:
1. The maximum length outside the building is 7 ft. Note that
outdoor length must be included in the overall vent length
calculation.
2. All normal termination clearances are maintained.
3. The pipe is supported every 24 in.
4. The exhaust and inlet are sloped back to the boiler ½ in. eleva-
tion for every linear foot.
5. The air-inlet and vent pipe must be located in a area where it
cannot be contacted or tampered with.
