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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 ll 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, efciency, 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 modied 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 modications 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
replace’s ue 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 oor level above the replace
(Figure 8.1). These openings are to hold the restop 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 specied 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 restop is required on each oor penetration in multi-
story installation. Building Codes require a restop at every
oor/ceiling level, including where the chimney penetrates
into the attic. Figure 8.1 shows a typical 2-story installation
with an attic.
Note: a restop is not installed where the chimney pen-
etrates through the roof.
• The restop is installed on the underside of the ceiling/oor
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 • 4059-682C• 8/12