NOTES:
(1) If an offset is necessary in the attic to avoid
obstructions, it is important to support the vent pipe
every 3 feet (914 mm), to avoid excessive stress
on the elbows, and possible separation. Wall straps
are available for this purpose (see Figure 40).
(2) When ever possible, use 45° degree elbows instead
of 90° degree elbows. The 45° degree elbow offers
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 41). The opening should be
framed to 10” (254 mm) x 10” (254 mm) inside
dimensions, in the same manner as shown in Figure
21.
(4) Any occupied areas above the rst oor, including
45° elbows (x2)
Wall strap
Plumber’s tape
connected to
wal strap
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 40: Use of Wall Straps.
Figure 41: Multi-Story Vent Pipe Installation.
Initial Installation
QUALIFIED INSTALLERS ONLY
30
To Next Page
Loading...
