Manual Dovre ASTRO 4CBWB LEON (page 31 of 164) (English, German, Dutch, French, Italian, Spanish)

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The flue or chimney must be airtight and well

cleaned and guarantee sufficient draught.

A draught/vaccuum of 15-20Pa during normal

operation is ideal.

Starting from the flue spigot, the flue must run as

vertically as possible. Changes in direction and

horizontal pieces disrupt the outward flow of

combustion gases and may cause the deposit of

soot.

The interior measurements should not be too big, to

prevent the combustion gases from cooling down

too much, thereby reducing the draught.

The flue or chimney must ideally have the same

diameter as the connection collar.

For the nominal diameter: see the appendix

"Technical data". If the smoke channel is well

insulated, the diameter may be slightly bigger

(up to 2x the section of the connection collar).

The section (area ) of the smoke channel must be

constant. Wider segments and (in particular)

narrower segments disrupt the outward flow of

combustion gases.

When using a cover plate or exhaust hood: make

sure that the cover does not restrict the flue outlet

and that the cap does not impede the outward flow

of combustion gases.

The chimney must end in a zone that is not

affected by surrounding buildings, adjacent trees or

other obstacles.

The chimney part outside the house must be

insulated.

The chimney must be at least 4metres high.

As a rule of thumb: 60cm above the ridge of the

roof.

If the ridge of the roof is more than 3metres away

from the flue: stick to the measurements in the

following figure. A = the highest point of the roof

within a distance of 3 metres.

Ventilation of the area

For good combustion, the appliance needs air

(oxygen). That air is supplied via adjustable air inlets

from the area where the appliance is installed.

The combustion will be incomplete in case of

insufficient ventilation, which results in toxic

gases being produced and spread through the

area.

As a rule of thumb, the air supply should be

5.5cm²/kW. Extra ventilation is needed when:

The appliance is in an area that is well insulated.

There is mechanical ventilation, for example a

central extraction system or an extraction hood in

an open kitchen.

You can provide extra ventilation by having a

ventilation louvre installed in the outside wall.

Make sure that other air consuming appliances (such

as tumble-driers, other heating appliances or a bath

room fan) have their own supply of outside air, or are

switched off when you use the appliance.

You can also connect the appliance to an

outside air supply. A connection kit is supplied

for this purpose. This makes additional

ventilation unnecessary.

Floors and walls

The floor on which the appliance is placed must have

sufficient bearing capacity. For the weight of the

appliance, see appendix "Technical data")

There may not be any electrical wires in the

floor below the appliance and in the walls

Subject to change because of technicalimprovements

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Dovre ASTRO 4CBWB LEON Manual

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