Mark GNSD Serie Livret Technique page 4

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M Flue fan inlet orifice diameter to specific type
N Flue fan bypass orifice diameter to specific type
O Restriction ring for short vertical flue system to specific category
P Restriction ring for short horizontal flue system to specific category
1.3 Warnings
General warnings
Appliance
Gas supply and connection
Flue gas discharge and outlet for flue duct/exhaust pipe
Combustion air supply piping and flue gas discharge piping should include as few bends as possible;
in general, resistance should be kept to a minimum, and the same diameter should be maintained
along the entire length under all circumstances.The exhaust pipe may not be supported on the
heater; instead, it should be appropriately suspended! If the exhaust pipe is laid alongside or
through flammable walls or flooring, a sufficient gap must be left between this and the pipe to
prevent fire.
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