General Information
The Fireplaces referenced in this installation manual
and DM chimney system are prefabricated, refractory
modular replaces and a chimney system designed for eld
assembly. The systems consist of interlocking precast parts
which are glued together with a masonry adhesive.
The parts of the Fireplaces and DM chimney system
are precast using a proprietary mixture of volcanic pumice
aggregate and cement. It includes all the parts necessary for
assembly of a complete rebox, smoke dome and chimney
system.
Each precast replace component is designed for a
specic part of the replace such that only one means for
assembly is possible.
The rebox and smoke dome are designed to be
tted with a traditional cast iron, poker-style throat damper,
however alternate dampers are an option.
The replaces require a standard refractory re
brick liner be applied to the interior of the rebox. Fire brick
must be a minimum thickness of one and one-eighth inches
(1-1/8”).
Isokern Fireplaces are available in nine sizes, seven
of which are covered in this manual: Isokern Standard sizes:
thirty-six (36), forty-two (42), and forty-six (46). Magnum
sizes: twenty-eight (28), thirty-six (36), forty-two (42) and
forty-eight (48). The Magnum is also available in two larger
sizes; information located online @ www.earthcore.co and
detailed in a separate installation manual.
All Isokern Standard units have a thirty-one and a
half inch (31-1/2”) rough opening height and the Magnum
units have a thirty-eight inch (38”) rough opening height
before re brick. The only parts which differ among the
available sizes are width and depth related pieces. The DM
chimney system is a dual module refractory chimney system.
The basic chimney consists of an outer casing block and an
inner liner. The chimney components are eld assembled
using Earthcore (EC) Mortar to glue the components together.
The DM chimney system also includes an offset
chimney block component, used to create 30° offsets to
the vertical run of the chimney. A brick ledge component
is available, designed to support chimney top brick veneer
nishes. Prefabricated masonry chimney termination caps
are also available.
The various replaces and the DM chimney
components will be described and illustrated in the following
pages. Close attention should be paid to each component
group’s specications and installation requirements as
described in this manual.
Important: Due to heat and weight issues, the replaces and
DM chimney system installations require that the system be
built upon a non-combustible concrete slab with no wood
underpinnings supported to footings with concrete or steel and
designed to carry the total weight of the replace and chimney
system.
The Fire-Lite application of the replaces is designed
to be built upon a combustible oor system and will also require
a design that will support the total weight of the Isokern replace
and chimney system. The FTF-13 or equivalent chimney system
only must be used with the Fire-Lite application. Please refer to
pages 46-51 for installation instructions.
Recommended minimum overall height for the
Isokern replace and DM chimney system for an indoor
application is 18’-0” when the chimney is straight and 21’-0”
when a chimney is offset. Maximum overall height is 82’ - 0”,
however, heights above those listed below require additional
structural support.
Maximum DM ue height without additional support needed:
Isokern Standard Series:
36 54’-0”
42 40’-0”
46 41’-0”
Magnum Series:
28 50’-0”
36 54’-0”
42 40’-0”
48 41’-0”
For heights above those listed above, consult a
structural engineer for additional structural support for the
DM chimney system. These heights do not reect information
regarding metal ue. Any UL 103 or Class A metal ue can
be used on an Isokern replace. See metal ue manufacturers
installation instructions for information relating to height
requirements/restrictions.
For outdoor applications, there is no minimum height
requirement for the DM chimney ue system. Any UL 103 or
Class A metal ue can be used on an Isokern replace. See metal
ue manufacturers installation instructions for information
relating to height requirements/restrictions.
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