Manual Dovre VISTA 900 (page 49 of 261) (English, German, Dutch, French, Italian, Spanish, Norwegian)

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Subject to change because of technical improvements 13

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 com-

bustion 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 nominal diameter: see "Technical data"

appendix. If the smoke channel is well insu-

lated, 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) nar-

rower segments disrupt the outward flow of com-

bustion gases.

In fitting a cover plate/exhaust cap to the flue:

make sure that the cover does not restrict the flue

outlet and that the cap does not impede the out-

ward 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 flue should 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 from

the flue: use the measurements given in the fol-

lowing figure. A = the highest point of the roof

within a distance of 3metres.

Room ventilation

For good combustion, the appliance needs air (oxy-

gen). This air is supplied via adjustable air inlets from

the area in which the appliance is installed.

If ventilation is insufficient, combustion will be

incomplete, which may lead toxic gases to

spread through the room.

As a rule of thumb, the air supply should be

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

The appliance is in a well-insulated area.

There is mechanical ventilation, for example a cent-

ral extraction system or an extraction hood in an

open kitchen.

You can provide extra ventilation by having a vent-

ilation louvre fitted on 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 out-

side air supply. A connection kit is supplied for

this purpose. This makes additional ventilation

unnecessary.

Floor and walls

The floor on which the appliance is placed must have

sufficient bearing capacity. The weight of the appli-

ance is given in the appendix “Technical Data

appendix”.

Protect flammable flooring from heat radiation

by means of a fireproof protective plate. See

the appendix "Distance from combustible

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Dovre VISTA 900 Manual

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