Empire Comfort Systems MILLIVOLT DVCP3630-1 Installation Instructions And Owner's Manual page 24

Installing Firestops
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. Refer to Figure 32 for sizing information. Secure firestop
with nails or screws. The heat shields of the firestops MUST BE
placed towards the top of the hole. Continue the vent run through
the firestops.
NOTICE: SD58DVAWTEC Wall thimble is necessary to maintain
the required three inches of clearance to combustibles above
the vent. Framed hole dimensions shown above are for this wall
thimble.
Vertical Firestops
Vertical runs of this system which pass through ceilings require
the use of ONE 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 fireplace and vent system, if
necessary, to accommodate ceiling joists and/or obstructions.
Cut a 10-5/8 inch x 10-5/8 inch hole (larger if within first 12-in
of rise) through the ceiling, using the center point previously
marked. Frame the hole with framing lumber the same size as
the ceiling joists. See Figure 33. 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 34.
If the area above the ceiling is an attic, position and secure the
firestop on top of the previously framed hole. See Figure 35.
Page 24
INSTALLATION
Figure 32
NOTICE: Remove insulation from the framed area in the attic
before installing the firestop and/or vent pipes.
NOTICE: Prevent insulation from contacting pipe after it is
installed.
Figure 33
Figure 34
Figure 35
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