Single wall flue pipes
Single wall, uninsulated flue pipe must be at least three times its internal diameter from combustible materials.
This means that your 5″ flue pipe should be 15″ away from combustibles, and your 6″ flue pipe should be 18″ away from combustibles, in any direction. You must also be sure you make the connection/change from single wall stove pipe to twin wall flue pipe at least 150mm before passing through a non-combustible wall or ceilling.
The combustible material can be heat shielded. The flue must be at least 1.5 times its external diameter away from the heat shield and, the heat shield must extend at least 1.5 times the flue's external diameter to each side of the flue. There then has to be an air gap of at least 12mm between the shielding material and the combustible material.
Twin wall flue pipes
The twin wall flue, because it is insulated, only has to be a minimum "x"cm from combustibles. “x” is usually 5cm, 6cm or 7cm, depending on supplier. Please note that our twin wall flues should be 60mm from combustibles.
To the Stove pipes To the twin wall flue pipes