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2.8 PREPARATION OF THE EXISTING FIREPLACE
• Approval must be obtained from the heating inspector/chimney sweep
for your district before the cassette is installed.
• The chimney must be swept, examined and tested for leaks.
• Check whether the open fireplace is suitable for installing a fireplace
cassette.
• Please note that the fireplace will be subjected to a higher level of stress
after the cassette has been installed.
• The existing open fireplace will be reduced in size due to the installation
of necessary thermal insulation coatings.
IMPORTANT: Take into account the following conditions when measuring up
for the fireplace cassette.
• Shut-off dampers are to be completely opened in the exhaust gas sys-
tem and locked in place so that they cannot close. If required, they are
to be totally removed.
• The combustion air feed pipes that lead to the fireplace must not be
closed. Ensure that there is sufficient combustion air (minimum 360 m³
per hour and m² of the firebox opening).
•
The fireplace cassette can be connected to a flexible exhaust gas flue,
which is fed through the existing chimney flue. This flexible exhaust gas
flue must correspond to DIN 1856-T2. (Manufacturer e.g.: Westaflex,
type: MS-System or Haflex, type: 870s)
3. FIRE PROTECTION
3.1 FLOORING
In front of the openings to fireplaces with closed fireboxes, flooring made
out of combustible materials must be protected by a covering of non-
combustible materials. The covering must extend outwards at the front by a
minimum of 500 mm and at the sides by at least 300 mm from the fireplace
opening (see Fig. 3).
The non-combustible covering can be made out of ceramics (e.g. tiles, flag-
stones), natural stone or other mineral construction materials (e.g. marble,
granite), metal with a thickness of at least 1mm or glass of corresponding
strength. The covering must be secured against dislocation.
A
XS 500
S 600
M 700
Floor covering
L 800
XL 900
GB 11
Fig.3
B
466 mm
566 mm
666 mm
766 mm
866 mm
GB
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