Figure 19
A single-walled pipe, installed outside or in areas subject to thermal variations, gives
rise to condensation of the water vapor present in the flue gases, so it is advisable to use
an insulated double-walled pipe.
The joints of the pipes must be very well sealed so that possible cracks do not allow
air to enter.
Correct seal Incorrect seal
Figure 20
It is recommended to install an automatic draught regulator set to 12Pa. This
mechanism will protect the recuperator from excess draught that can be produced by a
chimney with too much run, specific weather conditions or at hotter points of the
combustion cycles. Achieving stable control of the air stream will provide greater control
over the burning speed and therefore over energy input and fuel savings.
