3 types of chimney system
- Open flue
- room sealed
components of an open chimney
- Primary flue,
- draught diverter,
- secondary flue,
secondary flues must be supported at least
requirements of an open chimney
- No bends in primary flue,
- minimum of 600mm rise before any bends,
- bends shall not be more than 45o to the vertical,
- chimney / flue should be as vertical as possible.
Typical dimensions for a brick chimney
225mm x 225mm
When should a brick chimney be lined
should be lined if built after 1965 UK, 1971 Scotland.
csa for a pre-cast flue system
Requirements for terminal openings
Must be between 6mm & 16mm
Position of fan on a type B12 appliance
The fan is downstream of the heat exchanger.
Position of fan on a type B13 appliance
The fan is upstream to the heat exchanger
All chimneys and flues less than what diameter must have a terminal installed
What is the minimum spacing between two or more terminals
The requirements of 3 or more terminals less than 300mm apart
Must terminate at the same height.
when must a terminal guard be fitted
when terminal is within 2m of ground level