Owner`s manual

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9. INSTALLATIONS WITH THROUGH THE ROOF VERTICAL
TERMINATION
• Check the roof pitch to determine which roof flashing will be needed
- see vent accessories section 2.4.
• The distance from the roof to the lowest terminal discharge opening
(“H” in figure 35) depends on the roof pitch and must be in
accordance with the Dura-vent instructions supplied with the
termination unit.
Note: The venting system for these appliances is considered to be a
Special Venting System. The rule in the Installation Code requiring
a minimum vent height of 2ft above any portion of a building within
10ft does not therefore apply.
•
The minimum clearances to combustible materials all round the vent
pipes must be in accordance with the dimensions shown in section 4
of this manual.
• Drop a plumb from the ceiling to the center of the appliance vent
opening. Mark the position on the ceiling. Drill a small hole at the
marked position.
•
Determine the position where the vent will pass through the roof. If
directly above the position where it penetrates the ceiling, drop a
plumb from the roof to the small hole in the ceiling and mark the
roof at this spot.
If rafters or other obstructions will prevent a vertical exit or if clear
attic space is desired, the roof outlet can be offset using 45º elbows -
see fig. 35.
Drill a small hole at the marked position.
• A ceiling fire stop must be installed at the second floor and higher
floors.
A ceiling support should be used below the flat ceiling.
To install the fire stop & support cut and frame a 10” (254mm)
square hole centered on the small hole previously drilled - see fig.
36.
•
Fit vent accessory elbows and pipe lengths as required
up through ceiling support boxes and fire stops.
If installation includes offset, support the offsetting
pipes every 3 feet (1m) with wall straps (fig. 35).
• Cut a hole in the roof centered on the small hole. The
hole must allow for the minimum clearances to
combustible materials - see section 4.
•
Fit pipe lengths through the roof. Fit roof flashing
securing it with roofing nails.
• Fit storm collar and termination cap.
Fig 36 Fire stop hole
Fig 35 Through the roof installation