200mm
75mm
275mm
150mm S/S Flue Pipe
Minimum 25mm gap to combustible
materials
25mm gap to vent false chimney
250mm Outer Liner
200mm Inner Liner
Metal Flashing
Non Combustible Top Plate
e.g. 9mm Promina Board
(or thermal equivalent)
Height to suit Cowl
Minimum
FALSE CHIMNEY VENTED THROUGH 150-350 CASING COVER
NOTE: IT IS VERY IMPORTANT THAT THE SPACE BETWEEN THE FLUE PIPE,
INNER CASING AND OUTER CASING ARE VENTED AT THE TOP.
Figure 3