3.3.5 adding vent sections
Add chimney sections, according to the manufacturer's installation instructions. If the chimney system passes
through an attic space, a rafter radiation shield or attic insulation shield is required. The chimney must extend at
least 3ft (0.9m) above its point of contact with the roof and at least 2ft (0.6m) higher than any wall, roof or building
within 10ft (3.1m). If the chimney extends more than 5ft (1.5m) above the roof, it must be secured using a roof
brace or guide wires. A raincap must be installed to avoid internal damage and corrosion.
2 FT (0.6m) MIN
3 FT (1m)
10 FT (3m)
MIN
TO NEAREST
ROOFLINE
10 FT (3m)
3 FT (1m)
OR MORE
FLAT ROOF
Ceiling Joist
LIVING SPACE
Chimney must be
totally enclosed
when passing
through living space
with a minimum 2"
(51mm) clearance
to combustibles.
Floor, Ceiling Joist
LESS THAN
10FT (3m)
2 FT (0.6m)
RIDGE
MIN
3 FT (1m)
MIN
MIN
ATTIC SPACE
Chimney Lengths
Framed
Enclosure
2" (51mm)
clearance from
chimney to
combustible wall
installation
3 FT (1m)
MIN
LESS THAN
10FT (3m)
2 FT (0.6m)
MIN
WALL
39.2A
W415-4005 / A / 07.22.21
EN
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