XLR-PLUS Manual

C. Install the Ceiling Firestop

A ceiling fi restop MUST be used between fl oors and attics.

• SLP pipe only - Frame opening 229 mm x 229 mm (9 inch x 9 inch) whenever the vent penetrates a ceiling/floor (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 insulation around the vent. Insulation must be kept back from the pipe to prevent overheating.

ATTIC ABOVE

A

A

PIPE

SLP

A

229 mm (9 in.)

Figure 8.3 Installing Ceiling Firestop

INSTALL ATTIC INSULATION SHIELDS

BEFORE OR AFTER INSTALLATION OF VENT SYSTEM

3 FASTENERS

PER SIDE

CEILING FIRESTOP

INSTALLED BELOW CEILING

Figure 8.4 Installing the Attic Shield

Heat & Glo • XLR-PLUS-N-AU, XLR-PLUS-PB-AU • 2264-900 Rev. D • 6/11

CEILING FIRESTOP

INSTALLED ABOVE CEILING

31