Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
Page 8
3.7 Classification according to evacuation of combustion products
Class System description Comments:
B23
• Non-room sealed application; flue connected
to outside but combustion air is being drawn
directly from room where boiler is installed.
• Appliance complies with Class C
• Max. back pressure 1mbar (100Pa)
C13
• Room sealed premix appliance with
horizontal outlet
• Air intake and flue gas discharge through
concentric exterior wall terminal
• Type exterior wall duct
• Max. resistance 150 Pa
• Ducts sloped to drain toward boiler (1cm/m)
C33
• Room sealed premix appliance with vertical
outlet terminal
• Air intake and flue gas discharge through
concentric exterior roof terminal
• Type roof duct
• Max. resistance 150Pa
C43
• Room sealed premix appliance with
collective supply and discharge
• Max. resistance 150Pa
• Ducts sloped to drain toward boiler (1cm/m)
• Collective discharge with under pressure
C53
• Room sealed premix appliance with separate
supply from exterior wall and separate
discharge through roof
• Air terminal not provided by boiler
manufacturer
• Roof terminal not provided by boiler
manufacturer
• Max. resistance 150Pa
• Ducts sloped to drain toward boiler (1cm/m)
• Supply and discharge to be installed on the
same side of the building
C63
• Room sealed premix appliance with separate
approved and marketed system
• Only connect to UK approved discharge
material
• Max resistance 150Pa
C83
• Room sealed premix appliance with separate
supply from exterior wall and collective
discharge
• Type exterior wall duct not provided
• Max. resistance 150Pa
• Ducts sloped to drain toward boiler (1cm/m)
Vertical terminal Horizontal terminaL
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