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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
14 in. (345 mm)
diameter chimney
must extend at least
6 in. (152 mm) above
chase top flashing.
DuraChimney II
Pipe
1/2 in.
(13 mm)
Field-fabricated
spacers for chase
top flashing
Chase Top
Flashing or
Chase Pan
Storm Collar
20 in. diameter
opening
Chimney Cap
Maintain 2 in. (51 mm)
clearance between
DuraChimney II and
chase enclosure
• Chase top shrouds may be field constructed where
permitted by regional building codes.
WARNING! Risk of Fire! Shrouds must be constructed as
specifi ed. Improper construction may overheat chase top.
NOTICE: Some regional codes require an agency-Listed
shroud. Consult your local building offi cials.
10
10
Shrouds
• Hearth & Home Technologies Inc. supplies UL listed
shrouds. See your dealer for details.
A. Shroud Requirements
Figure 10.1 Shroud Requirements
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)
• 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).
Heat & Glo • RUTHERFORD-50 • 4059-333 Rev C • 06/08