Shrouds; Shroud Requirements - Heatilator BIR50 Owner's Manual

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Shrouds

A. Shroud Requirements
WARNING! Risk of Fire! Shrouds must be constructed as
specifi ed. Improper construction may overheat chase top.
• Chase top shrouds may be field constructed where
permitted by regional building codes.
NOTICE: Some regional codes require an agency-Listed
shroud. Consult your local building offi cials.
• Hearth & Home Technologies Inc. supplies UL listed
shrouds. See your dealer for details.
Shrouds can either be fi eld-fabricated or factory-fabricated,
but they must meet the requirements as specifi ed in these
instructions. Shrouds must be constructed of a minimum
24 ga (.024 in.) stainless steel, aluminized steel, galva-
nized 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 authroities for any additional shroud requirements.
Shrouds must be able to be removed to allow chimney ac-
cess to properly clean the chimney. DuraChimney II instal-
lations which include the use of a shroud must comply with
the following requirements (Figure 10.1)
14 in. (345 mm)
diameter chimney
must extend at least
6 in. (152 mm) above
chase top flashing.
Figure 10.1 Shroud Requirements
32
Allow a 1 in. (25 mm) air gap between
storm collar and chase top flashing
1/2 in. (13 mm) air space
established by spacers
1/2 in.
overhang
Heatilator • Birmingham BIR50 • 4059-332 Rev F • 11/08
• DuraChimney II must maintain at least 2 in. (51 mm)
clearance from combustible materials.
• The chase enclosure must be ventilated.
• The chase top fl ashing or fi eld-fabricated chase pan must
be used. Field-fabricated chase pans are acceptable if
they meet these requirements:
- Material must be 24 ga (.024 in) galvanized steel or
equivalent.
- Chase pan must have opening 3 in. (76 mm) larger
than outside diameter of chimney pipe with at least a
1/2 in. (13 mm) upturned fl ange/collar.
- Chase pan must overhang chase by 1/2 in. (13 mm)
per side for proper air fl ow.
- Chase pan must have a 1 in. (25 mm) down turned
outside edge (weather prtection).
Maintain 2 in. (51 mm)
clearance between
DuraChimney II and
chase enclosure
Chimney Cap
Storm Collar
Chase Top
Flashing or
Chase Pan
20 in. diameter
opening
DuraChimney II
Pipe
1/2 in.
(13 mm)
Field-fabricated
spacers for chase
top flashing