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C. Ceiling Firestop/Floor Penetra-
tion Framing
WARNING! Risk of Fire! DO NOT pack insu-
lation around the vent. Maintain clearances to
vent to prevent overheating.
A ceiling firestop MUST be used between
floors and attics.
• DVP pipe only - Frame an opening 10 in.
by 10 in. (254 mm by 254 mm) whenever
the vent penetrates a ceiling/floor (see
Figure 5.3).
• SLP pipe only - Frame opening 9 in. x 9
in. (229 mm x 229 mm) whenever the vent
penetrates a ceiling/floor (see Figure 5.3).
• Frame the area with the same sized lumber
as used in ceiling/floor joist.
• The ceiling firestop may be installed above or
below the ceiling joists when installed with an
attic insulation shield. It must be under joists
between floors that are not insulated. Refer
to Figure 5.4.
• Secure in place with nails or screws.
D. Install Attic Insulation Shield
WARNING! Fire Risk. The use of an attic
shield is required to prevent loose materials
or insulation from contacting the vent causing
overheating and a fire.
The International Fuel Gas Code requires an
attic shield constructed of 26 gauge minimum
steel that extends at least 2 in. (51 mm) above
insulation.
• Attic insulation shields must meet specified
clearances to combustible materials and be
secured in place.
• An attic insulation shield kit is available from
Hearth & Home Technologies. Contact your
dealer to order. Install attic insulation shield
according to instructions included with kit.
36
Figure 5.3
Figure 5.4 Installing the Attic Shield
Heat & Glo • SL-5F-IFT, SL-7F-IFT Installation Manual • 2638-980 Rev. H • 6/22
Installing Ceiling Firestop
INSTALL ATTIC INSULATION SHIELDS
BEFORE OR AFTER INSTALLATION OF VENT SYSTEM
CEILING FIRESTOP
INSTALLED BELOW CEILING
ATTIC ABOVE
A
A
A
PIPE
10 in. (254 mm)
DVP
9 in. (229 mm)
SLP
CEILING FIRESTOP
INSTALLED ABOVE CEILING
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