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FIREPLACES
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4.
STRUCTURE AND OPERATION OF THE INSERT
Fig. 3. CUBO fireplace cassette
The fireplace cassette consists of encasing 1, body 2 and front 12. The body is made of 3 mm thick P265GH
boiler steel. The front of the insert consists of steel door made of special profile, heat resistant glass pane and a
handle 10. The door is screwed to the body of the insert. The combustion chamber 5 is lined with AKUCERAM 6 on
the bottom, side walls and back wall.
The primary air supply takes place in 3 ways: through a special channel
located in the front part 14 behind the cover 8 and 9 bottom channel 16 or rear channel 17, regulated by a throttle
lever.
Throttle adjustment is done by moving the lever forward or backward. In the maximally retracted position,
the air supply to the afterburners and openings on the inclined surface 15 is cut off, and in the maximally extended
position the maximum air supply is open.
The air used to burn off fumes is realized by two systems. In the first system, the air enters the combustion
chamber through the holes located under the door, and then flows through the channel and comes out through
the holes located on the inclined surface of the combustion chamber 15. In the second system, the air goes behind
the AKUCERAM ceramic concretes located on the rear wall of the combustion chamber and comes out through the
holes of the afterburner 4 located in AKUCERAM. The air curtain has been designed to keep the glass clean when
burning fuels. The secondary air continuously between the housing and the body (above the door), through the
connection, blows out the air deflector 11 and goes on the glass.
Above the combustion chamber is a plate called deflector 3. The deflectors form a convection channel to
increase heat recovery. During combustion, the exhaust gases flow around the walls of the combustion chamber
and deflectors, get into the exhaust duct 13 and pass through the pipe to the chimney.