A MAJOR CAUSE OF VENT RELATED FIRES IS FAIL- URE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT DURACHIMNEY II BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS.
B. Clearances
Always allow at least a
•Never fill any required clearance space with insulation or any other materials.
•Combustible materials include lumber, plywood, sheetrock, plaster and lath, furniture, curtains, electrical wiring, and building insulation.
C. Installation Notes
Proper planning for your DuraChimney II installation will result in greater safety, efficiency, and convenience, as well as saving time and money. You must use only authorized DuraChimney II parts to maintain a listed chimney system. Do not mix parts or try to match with other products or use improvised solutions.
•Do not install damaged or modified parts.
•Practice good workmanship. Sloppy work could jeopardize your chimney’s safety.
•Keep electrical wiring and building insulation away from all chimneys.
•When deciding the location of your chimney, try to avoid modifications to roof beams and other structural components of the building.
If you have any questions, contact either your dealer or Simpson
D. Frame Openings
•From the ceiling, drop a plumb bob to the center of the fireplace’s flue outlet and mark this center point on the ceiling.
•Mark appropriate cutting lines around the center point. Cut a square hole in the ceiling. Frame a level, square, 21 in. x 21 in. (533 mm x 533 mm) opening centered over the hole that you have cut.
•Frame openings at each floor level above the fireplace (Figure 8.1). These openings are to hold the firestop and attic insulation shield.
•Locate each opening by dropping a plumb bob to the four corners of the opening below.
•Maintain the minimum
E. Cut Roof Opening
Determine and cut an opening in the roof directly above the opening below, and at least
•The chimney must be centered within this opening and maintain the minimum
F. Install Firestop
A firestop is required on each floor penetration in multi- story installation. Building Codes require a firestop at every floor/ceiling level, including where the chimney penetrates into the attic. Figure 8.1 shows a typical
Note: a firestop is not installed where the chimney pen- etrates through the roof.
•The firestop is installed on the underside of the ceiling/floor framing (Figure 8.2).
•Use a minimum of one 8 penny nail or one
Framing
Figure 8.2
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