Hearth and Home Technologies BIR50-B - Manual (Page 25)

25
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 2-inch clearance between Dura-
Chimney II Pipe and any combustible materials.
• 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 Dura-Vent directly.
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 2-inch clearance/air space. Maintain
the minimum clearances and dimensions as specified in
Table 8.1.
E. Cut Roof Opening
Determine and cut an opening in the roof directly above
the opening below, and at least 4-inches larger than the
chimney’s outside diameter to provide at least a 2-inch
clearance all around the chimney.
• The chimney
must be centered within this opening and
maintain the minimum 2-inch clearance to combustibles.
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 2-story installation
with an attic.
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 1-1/4” wood
screw per corner.
Framing
Figure 8.2
Heatilator • Birmingham BIR50-B • 4059-682D• 9/12