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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
25).
(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 26). The opening should be
framed to 10” (254 mm) x 10” (254 mm) inside
dimensions, in the same manner as shown in
Figure 19.
plumber’s tape
connected to
wall strap
Wall strap
45° elbows (x2)
Nails
Ceiling firestop
Ceiling
Second floor
Use clearances to as
defined by appliance and
vent pipe manufacturers.
(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 25: Use of Wall Straps.
Figure 26: Multi-Story Vent Pipe Installation.
Initial Installation
QUALIFIED INSTALLERS ONLY