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Installing Support Brackets (Figure 47)
A horizontal pipe support MUST BE used for each 3 feet of horizontal
run. The pipe supports should be placed around the pipe and nailed
in place to framing members. There MUST BE a 3-inch clearance
to combustibles above 6 5/8-inch diameter pipe and elbows and
1-inch clearance on both sides and bottom of 6 5/8-inch pipe to
combustibles on all horizontal pipe sections and elbows.
Vertical runs of this vent systems must be supported every 4 feet
above the appliance flue outlet by wall brackets attached to the 6
5/8-inch vent pipe and secured with nails or screws to structural
framing members.
PIPE STRAP
48"
(1219mm)
Installing Firestops (Figures 48, 49, 50, and 51)
Firestops are required for safety whenever the vent system passes
through an interior wall, an exterior wall, or a ceiling. These firestops
act as a firebreak heat shield and as a means to insure that minimum
clearances are maintained to the vent system.
Horizontal Firestops
Horizontal runs in the vent system which pass through either interior
or exterior walls, require the use of wall firestops on both sides of
the wall through which the vent passes.
Position the firestops on both sides of the framed hole previously
cut. See Figure 48. Secure firestop with nails or screws. Continue
the vent run through the firestops.
Page 36
FRAMING AND FINISHING
1" MIN.
(25.4mm)
FLUE OUTLET
Figure 47
11"
(297 mm)
MIN.
STUD WALL
INSIDE THIMBLE ASSEMBLY
Vertical runs of this system which pass through ceilings require the
use of ONE (1) ceiling firestop at the hole in each ceiling through
which the vent passes.
Position a plumb bob directly over the center of the vertical vent
component and mark the ceiling to establish the center point of the
vent. Drill a hole or drive a nail through this center point and check
the floor above for any obstructions such as wiring or plumbing
runs. Reposition the appliance and vent system, if necessary, to
accommodate ceiling joists and/or obstructions.
Cut a 10-inch x 10-inch hole through the ceiling, using the center
point previously marked. Frame the hole with framing lumber
the same size as the ceiling joists. See Figure 49. If the area
above the ceiling is NOT an attic, position and secure the ceiling
firestop on the ceiling side of the previously cut and framed hole.
See Figure 50. If the area above the ceiling is an attic, position
and secure the firestop on top of the previously framed hole. See
Figure 51.
NOTICE: Remove insulation from the framed area in the attic before
installing the firestop and/or vent pipes.
OUTSIDE THIMBLE ASSEMBLY
9 1/8"
(232 mm)
MIN.
Figure 48
EXTERIOR
SHEAVING
38714-5-0920
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