28
For Vertical Runs -
One ceiling firestop is
REQUIRED
at
the hole in each ceiling through which the vent passes. To
install firestops for vertical runs that pass through ceilings:
• Position a plumb bob directly over the center of the ver-
tical vent component.
• Mark the ceiling to establish the centerpoint of the vent.
• Drill a hole or drive a nail through this centerpoint.
• Check the floor above for any obstructions, such as wir-
ing or plumbing runs.
• Reposition the fireplace and vent system, if necessary,
to accommodate the ceiling joists and/or obstructions.
• Cut an 11” x 11” (280mm x 280mm) for D-Series or a
10” x 10” (254mm x 254mm) hole through the ceiling,
using the centerpoint previously marked.
• Frame the hole with framing lumber the same size as
the ceiling joists.
Figure 28. Ceiling Firestop (Ceiling Side)
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.
Figure 27. Hole & New Framing Members
If the area above the ceiling
IS
an attic, position and secure
the firestop on top of the previously framed hole.
NOTE: Keep insulation away from the vent pipe at least
1 inch (25mm).
Figure 29. Attic Firestop
JOIST
CEILING FIRESTOP
CEILING
NAILS (4 REQUIRED)
CEILING
CEILING FIRESTOP
RAFTER
NAILS (4 REQUIRED)
CEILING
NEW
FRAMING
MEMBERS
EXISTING CEILING
JOISTS
CHIMNEY
HOLE
11" (280 mm) or
10" (254 mm)
11" (280mm) or
10" (254mm)
NOTE: There must be NO INSULATION or other
combustibles inside the framed firestop opening.
!
C. Vent Termination
For Horizontal Terminations -
To attach and secure the
termination to the last section of horizontal vent:
• Rotate and interlock the ends as described at the be-
ginning of the Installing Vent Components section.
• The termination kit should pass through the wall firestops
from the exterior of the building.
• Adjust the termination cap to its final exterior position
on the building.
WARNING: THE TERMINATION CAP MUST
BE POSITIONED SO THAT THE ARROW IS
POINTING UP.
For trapezoidal cap termination kits:
• Using screws secure the cap to the exterior wall through
the flanges in the cap.
!
WARNING: THE BOTTOM OF THE VENT
TERMINATION CAP MUST BE A MINIMUM
OF 12 INCHES (305MM) ABOVE GROUND LEVEL
(GRADE). THE TOP OF THE CAP MUST BE A MIN-
IMUM OF 18 INCHES (457 MM) BELOW COMBUS-
TIBLE MATERIAL, SUCH AS A DECK. THE SIDE
OF THE CAP MUST BE A MINIMUM OF 6 INCHES
(152MM) AWAY FROM A PARALLEL OUTSIDE
WALL. VENTING TERMINALS SHALL NOT BE RE-
CESSED INTO A WALL OR SIDING. SEE THE DIA-
GRAM FOR VENT TERMINATION CLEARANCES.
7 1/4"
(184mm)
Figure 30. Trapezoid Termination Cap
