Baxi CBP Matic 18, Manual

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4.2. Installation of pipes and fume exhaust systems:

The exhaust pipe must have been designed for this purpose, in compliance to the
location requirements and in accordance with any applicable regulations.

Important! An inspection-"T", fitted with a hermetic lid, must be attached to
the end of the boiler's exhaust pipe to allow for the regular inspection of the system,
as well as the discharge of heavy dust and condensates.

As indicated in Figure 4, the exhaust duct must be assembled so as to permit its
cleaning and maintenance through the inspection points
.

Under normal operating conditions, the combustion gas flow should create a
draught of 12 Pa one meter above the chimney neck.

The boiler must not share the chimney with any other equipment.

The pipes located outside the boiler's working area must have an internal
diameter of 100 mm and be of double stainless steel insulation.

The fume exhaust pipe may generate condensation, so we recommend that
the appropriate systems for collecting condensates should be installed.
4.3. Installation without a shaft
Figure 5 and 6 illustrate the basic requirements when installing the boiler's chimney. A
"T" should be included at the base of the piping system for the purpose of periodic
inspections and annual maintenance, as exemplified. Double-walled stainless steel
insulated pipes must be used and properly fastened to avoid condensation.