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Heatilator • GDST3831I • 2127-900 Rev. K • 7/1232
C. Install the Ceiling Firestop
A ceiling fi restop MUST be used between
fl oors and attics.
• Frame opening 9 in. x 9 in. (229 mm x 229
mm) whenever the vent penetrates a ceiling/
fl oor (see Figure 8.3).
• Frame the area with the same sized lumber
as used in ceiling/fl oor joist.
• The ceiling fi restop may be installed above or
below the ceiling joists when installed with a
attic insulation shield. It must be under joists
between fl oors that are not insulated. Refer
to Figure 8.4.
• Secure with three fasteners on each side.
WARNING! Risk of Fire! DO NOT pack insu-
lation around the vent. Insulation must be kept
back from the pipe to prevent overheating.
Figure 8.3 Installing Ceiling Firestop
Figure 8.4 Installing the Attic Shield
3 FASTENERS
PER SIDE
INSTALL ATTIC INSULATION SHIELDS
BEFORE OR AFTER INSTALLATION OF VENT SYSTEM
CEILING FIRESTOP
INSTALLED BELOW CEILING
CEILING FIRESTOP
INSTALLED ABOVE CEILING
ATTIC ABOVE
A
PIPE
SLP
A
9 in. (229 mm)
A