Shrouds; Shroud Requirements; Shrouds A. Shroud Requirements - Heatilator BIR50-B Installation Manual

5

Shrouds

A. Shroud Requirements
WARNING! Risk of Fire!
specifi ed. Improper construction may overheat chase top.
• Chase top shrouds may be fi eld 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 supplies UL listed shrouds.
See your dealer for details.
Shrouds can either be fi eld-fabricated or factory-fabri-
cated, 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,
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 authroities for any additional shroud
requirements. Shrouds must be able to be removed to al-
low chimney access to properly clean the chimney. Dura-
Chimney II installations which include the use of a shroud
must comply with the following requirements (Figure 5.1)
14 in. (345 mm)
diameter chimney
must extend at least
6 in. (152 mm) above
chase top flashing.
Figure 5.1

Shroud Requirements

24 Heatilator • Birmingham BIR50-B Installation Manual • 4059-701 • Rev B • 2/6/13
Shrouds must be constructed as
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
• 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 protection).
Maintain 2 in. (51 mm)
clearance between
DuraChimney II and
chase enclosure
Chimney Cap
Storm Collar
Chase Top
Flashing
20 in. diameter
opening
Roof radiation
shields
DuraChimney II
Pipe
1/2 in.
(13 mm)
Spacers for chase
top flashing