Rational iCombi Pro Original Installation Instructions page 73

Requirements for device sizes 6 full size GN to 20 full size GN
The flue gas connection type B23 for these device sizes corresponds to a
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room air-dependent gas fireplace with a fan upstream of the burners with-
out flow protection and with a total nominal load in the installation area
greater than 14 kW.
To avoid a fire hazard due to grease in the grease filter, a distance of 400
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mm [15.75 inch] must be maintained between the flue gas pipes of the de-
vice and the grease filters of the extractor hood/ventilation ceiling.
An up-current socket is not required.
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The flue gases must be discharged into the open air via kitchen ventilation
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systems. The flue gases from the gas device with type A flue gas connection
are first discharged into the room and promptly discharged via kitchen ven-
tilation systems.
By monitoring the flue gas discharge, it must be ensured that the gas supply
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to the burners is only released if extraction is ensured.
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