Firenzo HASTINGS 4.8KW Instructions For Installation Manual - Page 12

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install an insulating chimney liner of the proper diameter. This will increase the draught, and improve the fuel

economy.

The height and positioning of the chimney must comply with the guidance given in Approved Document J of The

Building Regulations, particularly Sections 2.6 – 2.21 (pages 29-35).

The chimney must be accessible for external inspection, and it must be possible to access the cleaning doors

and the chimney if it is to be cleaned from the top (e.g. steel chimneys).

Be aware of the following:

Discuss the cleaning options with your chimney sweep or installer.

If there is insufficient draught in the chimney, it may be a good idea to install the flue pipe straight up so as to

minimise smoke migration in the actual combustion chamber.

Avoid having more bends than necessary, and limit the length of the flue pipe so as not to reduce the draught.

4.1 Fresh air supply

A wood-burning stove requires air for combustion. As a result, firing a wood-burning stove will help create a

healthy climate in your house. The ventilation requirements are described in Sections 2.1 – 2.3 and Table 1 of

the Approved Document J.

If it is necessary to install air grilles, they must be positioned so that they cannot be obstructed.

5. Draught conditions

If smoke comes out of the stove when the fire door is opened, it will be due to the poor draught in the chimney.

This type of stove requires at least 12 Pa of chimney draught to achieve satisfactory combustion and to prevent

smoke from escaping. Smoke may, however, escape in any event if the stove door is opened during vigorous

firing, so this should be avoided.

If in doubt, you may want to get your chimney sweep to measure the draught in the chimney.

Draught

The draught in the chimney is the result of the difference between the high temperature in the chimney and the

cooler temperature outside. Other factors that determine whether sufficient negative pressure can be produced to

create a draught include the length and insulation of the chimney, and wind and weather conditions. In the

unusual event of adverse weather conditions that cause downdraught, the appliance must not be used

The draught will be reduced when:

- The temperature difference is too low, e.g. in connection with a poorly insulated chimney. If the

chimney is cold, it may help to light (burn up) a rolled-up newspaper in the chimney's cleaning door.

- The outside temperature is too high, e.g. during the summer.

- There is no wind.

- The chimney is not tall enough, with the result that it sits in the lee of the roof surface or tall trees.

These conditions are also associated with the greatest risk of smoke coming back down the chimney.

- Air is entering the chimney in undesired places, e.g. through cracked joints or leaks in the cleaning

door or the flue pipe.

- Unsealed, unused fireplaces are connected to the chimney.

- The flue pipe and chimney are clogged up with soot due to inadequate cleaning.

- The house is too tightly sealed (please see the section on Fresh air supply).

A good draught is achieved when:

- There is a big difference between the temperature in the chimney and outside, i.e. when the need for

heating is greatest.

- The weather is clear and there is a good wind.

- The chimney is of the proper height, i.e. Minimum 4 metres above the stove, and clear of the spine of

the roof.

6. Firing/using the stove

Wood is a material that contains a great deal of gas (approx. 75%). The gases are released when the wood is lit

and heated. For this reason, it is important that these gases are ignited quickly after stoking. If the wood just lies

smouldering, especially after re-stoking, a lot of smoke is created which, in the worst case, may cause an

explosive ignition of the gases, resulting in damage to the stove.

In order to ignite the gases that are released from the wood, and to keep clear, lasting flames during the

combustion process, it is important to let in the required quantity of oxygen (air supply) at all times. The setting of

the air supply, the method of ignition and the lighting intervals depend on the draught in the chimney, the wind

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