KASTOR Karhu PK 007, Installation And Usage Manual, Page: 8 / 33

2.4. Safety distances and protections
2.4.1
.
Safety distances
For stone walls, the safety distances are 50 mm from the stove’s outer surfaces, preferably
100 mm to achieve sufficient air circulation. This means the stove will fit a niche of stove
width + 200mm (i.e. for the KARHU 20 that is 490 mm + 200mm = 690mm).
The safety distance to any flammable materials is 400mm from the stove’s outer surfaces. In
front of the stove, due to heat radiation and the working and maintenance space needed,
1,000 mm is a reasonable distance, but 500 mm is sufficient to ensure safety, if the panel
in front of it does not heat up beyond 85
o
C during the burn-in.
Safety distance upwards, table (1), measured from stone surface. A protective plate with a
30mm air slot must be placed on the ceiling if the measurements are not sufficient.
If the flue pipe starts off from the top of the stove with a no insulated connection pipe, the
required safety distance is 1,000 mm in all directions and 1,200 mm above.
The safe distance between a fitted water tank and the nearest flammable material is 150 mm.
Safety distances can be reduced if protection according to the instructions below is used, so
that the heater can be installed in a gap which is for example 1,100mm wide (e.g. KARHU
20/27's gap is 490mm + 250mm = 740mm). A 30mm air slot is left between the protective
cover's upper and lower edge in order to ensure sufficient ventilation.
2.4.2
.
Reduction of safety distances
Kastor protective walls and a stand are available. (picture 7)( 2.3). The chimney's isolated part
must reach the protective wall. Other protection is not needed.
If the sauna has a flammable floor in front of the stove, the area to be protected extends 100
mm beyond the door’s sides and a minimum of 400 mm in front of it. In this case, the
protection must be at least a 1 mm thick metal sheet.
If the stove is installed with one side and the back against a brick wall, safety distances of 50
mm to the side and 50 mm at the back are sufficient. If it stands with its back and both
sides next to brick wall, 100 mm should be left on both sides to ensure air circulation. At
the back, 50 mm remains sufficient.
The safety distances around a no insulated connection pipe can be reduced in a similar
manner. The pipe’s insulated part within the sauna must always extend to 400 mm below
the ceiling.
For chimneys, the minimum safety distances to flammable material differs from product to
product. Always check the manufacturer’s instructions. In case of doubt, approach your
local fire safety officials.
2.5. Connecting the stove to a brick chimney and instructions for KARHU-JK
stoves
The Karhu stove can be connected to a brick chimney from the back or the top. JK models
can only be connected from the top. For a brick chimney connection, the safety distances
and protectors named in chapter 2.4. and the chimney’s masonry regulations must be
adhered to.
2.5.1. Connection from the rear, only in KARHU models
Make an opening in the brick chimney that is 2-3cm wider than the connection pipe.
8