External-installation-connecting-flue-pipe-dw-to-dw

Contact & Advice

EXTERNAL SYSTEM CHIMNEY

Yes, this is required to protect the fabric of the building and gives a safe distance to combustibles within the wall cavity.

No, this is not required.

A wall support should be used immediately above the 135 degree tee to take the weight of the 135 degree tee. The tee is then suspended from the wall support top plate using the locking band for a secure fix.

With standard wall bands every 3m
With structural wall bands every 4m

The wall support with side plates pointing down will take 10m
The wall support with side plates pointing upwards will take 15m
The top plate used with cantilever brackets will take 15m

A structural wall band with structural wall band extensions should be used immediately above the offset.

60mm must be maintained to combustible materials.
50mm is the distance to non combustible materials.

3m is the maximum supported distance between elbows in an offset.
1.5m is the maximum distance unsupported between elbows in an offset.

The total number of changes of direction within a system is four, where a 90 degree tee or 90 degree elbow count as two changes of direction each.
The maximum number of offsets in a system is 2, providing that the chimney comes straight off the top of the appliance.

Using standard locking bands 1.5m
Using structural locking bands 3m.
In this case a structural locking band must be used on the joint directly below the last wall band or support, and on each pipe joint above it. A structural locking band is not required on the terminal.

CONNECTING PIPE THROUGH WALL

Yes. Adaptors are available in the ICS range; please refer to catalogue and installation instructionS.

No. The system is designed to provide a gas tight joint. Sealant is only required where the ICS connects to the appliance. Here you should use rope gasket and a suitable high temperature sealant to provide a gas tight joint.

Unless you are able to sweep the chimney through the stove, then a cleaning access will be required in the flue pipe.

An adjustable pipe should be used.

60mm.

It is recommended that there is a minimum vertical height of 600mm before any offset.

The total number of changes of direction within a system, from the appliance connector through to termination, is four, where a 90 degree tee or 90 degree elbow count as two changes of direction each.
The maximum number of offsets in a system is 2, providing that the chimney comes straight off the top of the appliance.

Yes, this is required to protect the fabric of the building and gives a safe distance to combustibles within the wall cavity.

No, this is not required.

ADDITIONAL NOTES

Connection to an appliance, which is not connected to the fuel supply, may be carried out by a competent person. However connection to an appliance, which is connected to the fuel supply, must be carried out by a GAS SAFE (gas) or OFTEC (oil) registered installer.

Schiedel Chimney Systems Ltd. recommend the use of HETAS registered installers for solid fuel applications. This installation assistant is to be used as a visual aid only, by qualified installers, in conjunction with the detailed component installation instructions.

For full design and installation details, the key referral documents are as follows:

BS EN 1856-1: Chimneys – System Chimney Products
BS EN 1859: Metal Chimneys – Testing Methods
BS EN 1443: Chimneys – General Requirements
BS EN 15287-1: Chimneys. Design, installation and commissioning of chimneys. Chimneys for non-roomsealed heating appliances.
BS 5440-1: Fluing and ventilation for gas appliances of rated input not exceeding 70kW net (1st, 2nd and 3rd family gases). Specification for installation of gas appliances to chimneys and for maintenance of chimneys.
Approved Document J: – Combustion appliances and fuel storage systems (England & Wales)
DFP Technical Booklet L: – Combustion appliances and fuel storage systems (NI)
Technical Handbook (Domestic & Non Domestic), Section 3 – Environment (Scotland)
Appliance Installation Instructions and related standards.
Other standards covering specific applications will also be relevant and must be adhered to.

Planning permission may be required, and reference should be made to the local Building Control Department.

Ensure all chimney components are available and check them to ensure there has been no damage.

Do not use damaged components. Build the chimney up through the previous designed route which should be as straight as possible.