40
NOTES:
(1) If an oset is necessary in the attic to avoid
obstructions, it is important to support the vent
pipe every 3’ (914 mm), to avoid excessive stress
on the elbows, and possible separation. Wall straps
are available for this purpose (see Figure 48).
(2) When ever possible, use 45° degree elbows instead
of 90° degree elbows. The 45° degree elbow oers
less restriction to the ow of ue gases and intake
air.
(3) For multi story installations; a ceiling restop is
required at the second oor, and any subsequent
oors (see Figure 29). The opening should be
framed to 10” (254 mm) x 10” (254 mm) inside
dimensions, in the same manner as shown in Figure
49.
45° elbows (x2)
Wall strap
Plumber’s tape
connected to
wal strap
(4) Any occupied areas above the rst oor,
including closets and storage spaces,
which the vertical vent passes through,
must be enclosed. The enclosure may be
framed and sheet-rocked with standard
building materials. However consult
the appliance manufactures installation
instructions for the minimum allowable
clearance between the outside of the vent
pipe, and the combustible surfaces of
the enclosure. Do not ll any required air
spaces with insulation.
Figure 48: Use of Wall Straps.
Figure 49: Multi-Story Vent Pipe Installation
Initial Installation
QUALIFIED INSTALLERS ONLY
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