IDEAL EVOMAX 30 Product Manual page 38

FLUE TYPES
Before ventilation can be sized we need to identify the type of flue system.
Type B – Open flue
Type C – Room sealed
We also need to know the classification of the room type.
• Boiler house – a dedicated building for the installation of boilers and ancillary plant.
• Boiler room – a dedicated room within a building for the installation of boilers and ancillary plant.
• Enclosure – space in which a boiler(s) is installed, which is not large enough to permit access for work other than
maintenance via external access.
• Plant room – a room in a building that houses plant and machinery.
• Open space – e.g. in a warehouse.
CLASSIFICATION OF TYPE B FLUES
Appliance type Primary definition
B1- appliance with a
draught diverter
B open flue
B2 – appliance
without draught diverter
*Appliance fan also downstream of draught diverter
TYPE B11
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Natural draught
B11
B21
TYPE B12
TYPE B22
Fan down stream of
heat exchanger
B12
B14*
B22
TYPE B13
TYPE B23
Fan upstream of heat
exchanger
B13
B23
TYPE B14