DuraVent DuraTech Shroud - Manual (Page 3)

3
SHROUD REQUIREMENTS
Shrouds can either be field-fabricated or
factory-fabricated, but they must meet the
requirements as specified in these instructions.
Shrouds must be constructed of a minimum
24 gauge (.024”) stainless steel, aluminized
steel, galvanized steel, or copper. Other
materials may also be used, such as brick,
mortar, stucco, stone, etc., provided they
are completely non-combustible. Check with
your local building code authorities for any
additional shroud requirements. Shrouds
must be able to be removed to allow chimney
access to properly clean the chimney.
DuraTech installations which include the use
of a shroud must comply with the following
requirements (Figure 1):
▪ DuraTech chimney must maintain at least 2”
clearance from combustible materials.
▪ The chase enclosure must be ventilated.
▪ The Chase Top Flashing or field-fabricated
chase pan must be used. Fieldfabricated
chase pans are acceptable if they meet these
requirements:
▪ Material must be 24 gauge (.024”)
Galvanized steel or equivalent.
▪ Chase pan must have opening 3”
larger than outside diameter of
chimney pipe with at least a 1/2”
upturned flange/collar.
▪ Chase pan must overhang chase
by 1/2” per side for proper air flow.
▪ Chase pan must have a 1” down
urned outside edge (weather
protection).
ALLOW A 1-INCH AIR GAP BETWEEN STORM
COLLAR AND CHASE TOP FLASHING
1/2” AIR SPACE ESTABLISHED
BY SPACERS
5”-16” DIAMETER
CHIMNEY MUST
EXTEND AT LEAST 3-
INCHES, 18”-24” MUST
EXTEND AT LEAST 6-
INCHES ABOVE CHASE
TOP FLASHING.
1/2-INCH
FIELD-FABRICATED
SPACERS FOR CHASE
TOP FLASHING
1/2-INCH
OVERHANG
CHIMNEY CAP
STORM COLLAR
CHASE TOP
FLASHING OR
CHASE PAN
DURATECH
CHIMNEY
MAINTAIN 2-INCH
CLEARANCE BETWEEN
DURATECH CHIMNEY AND
CHASE ENCLOSURE
Figure 1