ULTD_WHE_2S3S_01
18
10
Smoke deflection plates
When the door is closed, valve A and C are also closed. This optimises the combustion and efficiency.
When the door is opened, for example to add new wood, valves A and C will also open so as to
prevent any backdraught into the room. As a result, efficiency is minimal when the door is open.
Depending on the construction of the flue pipe, there may be less of a draw in the chimney in some
cases. This can lead to backdraught into the room when the door is open. If this is the case, plate B
can be taken out of the appliance to prevent backdraught due to a poorly functioning chimney.
Door closed
Door open
Flue gasses
Flue gasses
C
C
B
B
A
A
