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Dovre VISTA 900 Manual

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Subject to change because of technical improvements 17
A
A
B
C
09-20021-129
A Convection air current
B Radiated heat
C Air supply from the room to be heated
When building the hearth, follow these instruc-
tions for the convection space:
The top of the convection space must be closed air-
tight using a cover plate of non-flammable and
heat-resistant material.
The cover plate must be level and placed at least
30 cm below the flue opening in the ceiling.
Air inlet grates must be fitted at the bottom of the
hearth to allow for ambient air intake. The minimum
air inlet opening is 250 cm2. If the space is not suf-
ficiently ventilated, you must provide for outside air
to be allowed in by means of the outside air
connection kit or an optional adjustable damper.
Air outlet grates must be installed at the top of the
hearth just below the cover plate. The minimum air
outlet opening is 500 cm2.
The inlet and outlet grates are available as
options.
Do not use combustible material in the con-
vection space, and avoid the effect of thermal
bridging when using materials that conduct
heat.
Follow the instruction below when building the
hearth:
1. Build the base of the hearth and fit the air inlet
grates into the masonry.
You can place the air inlet grates on all sides of
the base.
Make sure the door of the appliance can swing
freely over the hearth floor.
2. Build the hearth up to the smoke dome.
Ensure that a clearance of 2 mm is maintained
between the built-in fireplace and the masonry
to accommodate the thermal expansion of the
fireplace.
3. The inside of the convection space may, if
desired, be cladded with reflective, insulating
material.
Additional cladding of the convection space pre-
vents unnecessary thermal radiation towards
outer walls and/or adjacent rooms. It also pre-
vents damage to the hearth wall insulation.
4. Build the rest of the hearth up to the flue opening
hole in the ceiling.
The masonry should not rest on the fireplace.
Use a support such as a steel beam. Leave a
clearance of at least 3 mm between the sup-
port and the appliance.
5. Close the convection space with the cover plate.
6. Put the air outlet grates under the cover plate.
7. Make an opening above the cover plate in order to
prevent any pressure build-up.
… 53 …


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