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Water heater categories - types of flue gas systems.
Type according EN 15502-2-1: 2012
B23(P)
special
air inlet
B23
C13
C33
Concentric roof terminal
concentric/
parallel adaptor
Performance
flue outlet
Open
Air supply from
room
Closed
Air supply from
outside
Concentric
wall outlet
Closed
Air supply from
outside
E93.1804.014
Description
* Roof terminal
* Without draught diverter
* Water heater room air supply.
* P = overpressure systems
See: Typical examples - example C
Notice: The installation room has to have
sufficient air supply vents. These vents
must be open and may not be closed or
blocked. Requirements in accordance
with national and local standards, e.g.
IGEM/UP/10 and BS 6644.
Note: Special air inlet needed for IPX4D pro-
tection class (accessory, see § 5.1).
* Wall outlet.
* Air supply inlet and flue gas outlet at the
same air pressure zone.
(a combined wall outlet e.g.).
See: Typical examples - example E
* Flue terminal at the roof.
* Air supply inlet and flue gas outlet located
at the same air pressure zone
(a combined roof terminal e.g.).
See: Typical examples - example B
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