DuraVent DuraChimney II Shroud User Manual

Installation Instructions

DuraChimney II 10" - 16"
Chimney Shroud

DuraChimney II Shroud

A MAJOR CAUSE OF CHIMNEY RELATED FIRES IS FAILURE

TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO

COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE

THAT THIS CHIMNEY BE INSTALLED ONLY IN
ACCORDANCE WITH THESE INSTRUCTIONS.

NOTE:
Read through all these instructions
before beginning your installation. Failure
toinstall the chimney as described in these
instructions will void the manufacturer’s
warranty and may have an effect on your
homeowner insurance and UL listing status.
Refer to the DuraChimney II Installation
Instructions for complete details on
installing the DuraChimney II system. Keep
these instructions for future use.

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APPLICATION AND LISTING

As specied in these instructions, Shrouds are
approved for use with DuraChimney II (10”­16” diameter). A Shroud built and installed in
compliance with these instructions is UL listed
for use with DuraChimney II (listing number
MH7399).

INSTALLATION NOTES

Practice good workmanship. Exercise extreme
caution when working on roofs. Be
sure to wear appropriate safety gear and
clothing as needed. Refer to the DuraChimney
II Installation Instructions for further safety
details.

MH7399

SHROUD REQUIREMENTS

Shrouds can either be eld-fabricated or
factory-fabricated, but they must meet the
requirements as specied 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):

ALLOW A 1-INCH AIR GAP BETWEEN STORM
COLLAR AND CHASE TOP FLASHING

1/2” AIR SPACE ESTABLISHED
BY SPACERS

▪ DuraChimney II must maintain at least 2”
clearance from combustible materials.
▪ The chase enclosure must be ventilated.
▪ The Chase Top Flashing or eld-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 ange/collar.
▪ Chase pan must overhang chase
by 1/2” per side for proper air ow.
▪ Chase pan must have a 1” down
turned outside edge (weather
protection).

CHIMNEY CAP

STORM COLLAR

10”-16” DIAMETER

CHIMNEY MUST

EXTEND AT LEAST 6-

INCHES ABOVE CHASE

TOP FLASHING.

1/2-INCH
OVERHA NG

DURA

CHIMNEY II

PI PE

MAINTAIN 2-INCH
CLEARANCE BETWEEN
DURACHIMNEY I I AND
CHASE ENCLOSURE

Figure 1

CHASE TOP
FLASHING OR
CHASE PAN

1/2-INCH

FIELD-FABRICATED

SPACERS FOR CHASE

TOP FLASHING

3