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H. Separate Vertical Venting System
Vertical Venting
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1. Do not exceed maximum vent lengths. Refer to
Table 1.
2. Slope horizontal runs minimum ¼ inch per foot
down towards boiler.
3. Install fire stops where vent passes through floors,
ceilings or framed walls. The fire stop must close
the opening between the vent pipe and the structure.
Fire stop manufacturers are Air-Jet, American Metal
Products, Metal-Fab, and Simpson Dura-Vent.
4. Whenever possible, install vent straight through the
roof. Refer to Figure 9 if offset is necessary. Main-
tain minimum clearance to combustible
materials.
5. Install Vent Terminal.
a. Size roof opening to maintain minimum clear-
ance from combustible materials.
b. Extend vent pipe to maintain minimum vertical
and horizontal distance of twelve (12) inches
from roof surface. Allow additional vertical dis-
tance for expected snow accumulation. Provide
brace as required. Refer to Figure 11.
c. Vertical venting requires use of the roof flashing
and storm collar to prevent moisture from enter-
ing the structure.
d. Install storm collar on vent pipe immediately
above flashing. Apply Dow Corning Silastic 732
RTV Sealant between vent pipe and storm collar
to provide weathertight seal.
e. Attach vent terminal.
Vertical Air Intake Piping
1. Do not exceed maximum air intake length. Refer to
Table 1.
2. Locate air intake termination on the same roof loca-
tion as the vent termination if possible, to prevent
nuisance boiler shutdowns. However, boiler may be
installed with vertical venting and sidewall combus-
tion air inlet or vica versa, if installation conditions
do not allow alternate arrangement.
3 Use single wall metal pipe and fittings or thin wall
PVC available at most heating distributors.
4. Air intake termination must be located:
Vertical - At least twelve (12) inches above the roof
surface plus the expected snow accumulation.
5. Start at collar on burner enclosure (inside boiler
jacket) and work towards the air intake terminal.
6. Maintain minimum of 1/4 inch per foot slope on
horizontal runs. Slope down towards boiler.
7. The air intake pipe must be adequately supported
- See Figures 9, 10, and 11.
–
with straps or supports no less than five (5) feet
apart on horizontal runs. The complete air intake
piping system must be rigid and able to withstand
minor impacts without collapse.
8. Inlet air pipe penetration:
Vertical - Size roof opening to allow easy insertion
of inlet piping and allow proper installation of flash-
ing and storm collar.
a. Use appropriately designed vent flashing when
passing through roofs. Follow flashing manufac-
turers' instructions for installation procedures.
Flashing manufacturers are Air-Jet, American
Metal Products, Metal Fab, and Simpson Dura-
Vent.
b. Extend air intake pipe to maintain minimum
vertical and horizontal distance of twelve (12)
inches from roof surface. Allow additional verti-
cal distance for expected snow accumulation.
Provide brace as required. Refer to Figure 11.
c. Vertical air intake requires flashing and a storm
collar to prevent moisture from entering the
structure.
d. Install storm collar on air intake pipe immediate-
ly above flashing. Apply Dow Corning Silastic
732 RTV Sealant between air intake pipe and
storm collar to provide weathertight seal.
9.
Seal all joints airtight, using silicone caulk or self -
adhesive aluminum tape.
10. Install Air Intake Terminal:
Vertical - Insert intake piping into intake terminal
collar. Secure terminal to intake piping and seal
joint with silicone caulk.
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