Isokern Standard 36 - DM Chimney System; General Information

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DM Chimney System: General Information
The DM chimney system is a dual module, refractory masonry
chimney system. It is composed of two precast, mating components,
the outer casing block and an inner liner.
General Information:
This chimney system is designed for installation in accordance
with the National Fire Protection Standard for Chimneys and Solid
Fuel-Burning Appliances, NFPA 211 and in accordance with codes
such as ICC, BOCA Basic/National Codes, the standard Mechanical
Code and the Uniform Building Code.
Note: Illustrations shown reect “typical” installations with nominal
dimensions and are for design and framing reference only. Always
maintain minimum required clearances to combustible materials and
do not violate any specic installation requirements.
Required DM Chimney Clearance:
The DM chimney system, rated UL 103HT, is listed for zero
clearance to normal construction materials.
The DM chimney system may be enclosed in a wood chimney
chase at zero clearance to wood framing members.
WARNING: Keep all insulation minimum of three inches (3”)
away from all DM chimney components. If insulation is used in
walls surrounding the chimney, insulation may be installed behind
sheathing of gypsom board, plywood, particle board or other material
on the side facing the Isokern material. The facing material cannot be
within 1 1/2” to the chimney outer casing. Failure to use manufacture’s
provided parts or variations in techniques and construction materials
or practices other than those described in this manual may create a re
hazard and void the limited warranty.
Note: A restop is required wherever a chimney passes between one
zone of a building to another. Ex: When the chimney passes through
the ceiling into the attic area, there must be a sealed area around the
chimney so there isn’t a chaseway for a re to get to the attic.
When lateral support is required for DM chimneys, the
framing members will be in contact with the DM chimney system.
Important: “Combustibles” are dened as “normal construction
materials” and are considered to be: framing materials, particle board,
mill board, drywall, plywood paneling, plywood sub ooring, and
wood ooring.
Mechanical Vent Systems:
It is acceptable to use mechanical draft systems, if the venting
companies do the engineering calculations and make the necessary
recommendations for fan size and ue vent diameter following
the guidelines of NFPA 211/2006, pg. 211-13. Installation of such
systems must also follow the mechanical drafting company’s explicit
installation and operation instructions.