Empire Comfort Systems DVL25FP32-1 Installation Instructions And Owner's Manual page 24

FRAMING AND FINISHING (continued)
Vertical Firestops (Figures 32, 33 and 34)
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 32.) 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
33.) If the area above the ceiling is an attic, position and secure the
Figure 34
firestop on top of the previously framed hole. (See Figure 34.)
See Vertical Termination Pages 27 & 28.
NOTE: Remove insulation from the framed area in the attic before
installing the firestop and/or vent pipes.
Figure 32
Figure 33
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