Rayburn 212SFW, 200SFW The Chimney, Checking Existing Chimney, Erecting New Chimney

THE CHIMNEY

The minimum chimney draught requirement for the 200SFW at nominal total heat output is 2.5 Pa.

The minimum chimney draught requirement for the 212SFW at nominal total heat output is 12 Pa.

The mean flue gas temperature of the Rayburn 200SFW directly downstream of the flue spigot at nominal heat output is 131ºC.

The mean flue gas temperature of the Rayburn 212SFW directly downstream of the flue spigot at nominal heat output is 210ºC.

The appliance is not suitable for installation in a shared flue system

Checking Existing Chimney

The internal and external location of the chimney should be checked before the appliance is installed and rectification made where necessary to prevent leakage or porosity. The soundness of the chimney which should have a minimum flue dimension of 150mm can be confirmed by smoke testing.

Advice on the test method can be obtained from HETAS Ltd.

When repairing or re-using existing chimneys it is recommended that the building control officer be consulted before the commencement of work with particular attention to the chimney height and its termination

The chimney MUST be swept before installation.

Erecting New Chimney

The flue through the chimney should be formed with pre-cast moisture and acid resistant liners with a minimum internal diameter of 150mm diameter and all in accordance with the current Building Regulations (England and Wales) and in Scotland the Building Standards (Scotland) (Consolidation) Regulations and the Codes of Practice for chimneys and flues BS. 6461 Part 1 and BS. 7566 Parts 1 to 4.

Ensure the chimney liners are free of projecting internal building jointing composition before the appliance is installed.

Factory-Made Insulated Chimneys

It is recommended the chimney be ceramic lined and comply with BS. 4543: Part 2.

The minimum diameter for a straight chimney is 150mm and there should be not more than two bends of 45º from vertical.

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DESN 510181 C

DESN 510182 C

DESN 510183 C

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