Manual Dovre ASTRO 4MFP (page 35 of 154) (English, German, Dutch, French, Spanish)

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The flue must satisfy the following requirements:

The flue or chimney must be made of fire-resistant

material, preferably ceramics or stainless steel.

The flue or chimney must be airtight and well-

cleaned and guarantee sufficient draught.

A draught/vacuum 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 soot deposits.

To prevent combustion gases from cooling down

too much, which reduces the draught, ensure that

the interior diameter is not too big.

The flue or chimney should 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 flue must end in a zone that is not affected by

surrounding buildings, trees or other obstacles.

The flue 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 stove needs air (oxygen).

This air is supplied via adjustable air inlets from the

area in which the stove 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 stove 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 fitted on the outside wall.

Make sure that other air consuming appliances (such

as tumble-driers, other heating appliances or a

bathroom 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. This makes additional

ventilation unnecessary.

Subject to change because of technical improvements

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Dovre ASTRO 4MFP Manual

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