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DM 54 Chimney System: General Information
The DM 54 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 54 Chimney Clearance:
The DM 54 chimney system, rated UL 103HT, is listed for
zero clearance to normal construction materials.
The DM 54 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 54 chimneys the
framing members will be in contact with the DM 54 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.
WARNING:
Keep all insulation minimum of three inches (3”) away
from all DM 54 chimney components. 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 fire
hazard and void the limited warranty.
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.
