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21759-6-0608 Page 37
Installing Support Brackets (Figure 58)
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 8 inch diameter pipe and elbows and 1
inch clearance on both sides and bottom of the 8 inch dia. 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
8 inch vent pipe and secured with nails or screws to structural
framing members.
Figure 58
Installing Firestops (Figures 59, 60, 61, and 62)
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 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.
Cut a 10-3/8 inch x 12-3/8 inch hole in wall. Position firestop
(SD1249) on interior side of wall for 10-3/8 inch x 12-3/8 inch
hole.
Attention: Wall firestop hole is off-set towards bottom of wall
opening. Secure with nails or screws. Continue the vent run through
the firestop. See Figure 59.
10
3/8
12 3/8
WALL FIRESTOP
HOLE IS OFF-SET
TO
WARDS BOTTOM
OF
WALL OPENING.
Figure 59
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 1/2 inch x 10 1/2 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 60. 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
61. If the area above the ceiling is an attic, position and secure the
firestop on top of the previously framed hole. See Figure 62.
NOTE: Remove insulation from the framed area in the attic before
installing the firestop and/or vent pipes.
8" VENTING FRAMING AND FINISHING