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Shroud requirements – DuraVent DuraChimney II Shroud User Manual

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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.

DuraChimney II installations which include the

use of a shroud must comply with the following

requirements (Figure 1):

▪ DuraChimney II 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

turned outside edge (weather

protection).

ALLOW A 1-INCH AIR GAP BETWEEN STORM

COLLAR AND CHASE TOP FLASHING

1/2” AIR SPACE ESTABLISHED

BY SPACERS

10”-16” DIAMETER

CHIMNEY 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

DURA

CHIMNEY II

PIPE

MAINTAIN 2-INCH

CLEARANCE BETWEEN

DURACHIMNEY II AND

CHASE ENCLOSURE

Figure 1