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1.21 CONFIGURATION TYPE B, OPEN CHAMBER AND FAN ASSISTED FOR INDOORS
The appliance can be installed inside buildings in B
or B
mode; in this case, all technical rules and national and local regulations in
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force, must be complied with.
For installation, the cover kit must be used, referred to in (Par. 1.14).
1.22 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue exhaust does not necessarily have to be connected to a branched type traditional flue for type B appliances with natural draught
(CCR).
The flue exhaust, for boiler clots installed in C configuration, can be connected to a special LAS type multiple flue.
For B
configurations, exhaust is only allowed into individual chimney or directly into the external atmosphere via a relevant terminal,
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unless otherwise provided by local regulations.
The multiple flues and the combined flues must also only be connected to type C appliances of the same type (condensation), having nom-
inal heat inputs that do not differ by more than 30% less with respect to the maximum that can be attached and powered by the same fuel.
The thermo-fluid dynamic features (flue flow rate, % of carbon dioxide, % humidity etc.) of the appliances attached to the same multiple
flues or combined flues, must not differ by more than 10% with respect to the average appliance attached.
Multiple and combined flues must be specially designed according to the calculation method and requirements of the standards (such as
UNI 13384), by professionally qualified technical staff.
Chimney or flue sections for connection of the flue exhaust pipe must comply with requisites of technical standards in force.
It is possible to replace a type C conventional device with one provided with condensation only, if the derogation conditions established
by the regulations in force have been verified.
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