C. Install the Ceiling Firestop
A ceiling firestop MUST be used between floors and at- tics.
•Frame an opening 10 in. by 10 in. (254 mm by 254 mm) whenever the vent penetrates a ceiling/floor (see Figure 8.3).
•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 a attic insulation shield. It must be under joists between floors that are not insulated. Refer to Figure 8.4.
•Secure with three fasteners on each side.
WARNING! Risk of Fire! DO NOT pack insulation around the vent. Insulation must be kept back from the pipe to pre- vent overheating.
Attic Above
10 in. (254 mm)
10 in. (254 mm)
Hole should measure
10 in. x 10 in.
(254 mm x 254 mm)
inside to inside
Figure 8.3 Installing Ceiling Firestop
Install attic insula- tion shields before or after installation
of vent system.
3 fasteners 
per side 
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Ceiling |
| firestop | Ceiling |
| firestop | |
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installed below ceiling. | installed above ceiling. | |||||
Figure 8.4 Installing the Attic Shield |
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Heatilator • ICON | 29 |
