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DM Chimney System: General Information
The DM chimney 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
Codes.
Note:
Illustrations shown reflect “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 specific 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.
Note:
A firestop 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 fire to get to
the attic.
Since lateral support is required for DM chimneys
the framing members will be in contact with the DM chimney
system.
Important:
“Combustibles” are defined as “normal construction
materials” and are considered to be: framing materials, particle
board, mill board, drywall, plywood paneling, plywood sub
flooring, and wood flooring.
Keep all insulation, vapor barriers, “house wrap” paper and
other insulating type membranes and products, including
fiberglass, cellulose and other insulation, (anything that
carries an “R” rating) a minimum of three inches (3”) away
from all firebox and chimney surfaces.
Exception:
If insulation is used in walls surrounding the fireplace,
insulation may be installed behind sheathing of gypsom board,
plywood, particle board or other material on the side facing
the Isokern. The facing material cannot be within 1 1/2” to the
fireplace sidewalls.
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 flue 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.
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