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20. The ventilation should not be impeded by covering the ventilation openings with items,
such as newspapers, table-cloths, curtains, etc.
21. No naked flame sources, such as lighted candles, should be placed on the apparatus.
22. The apparatus should be used in moderate climate.
23. The apparatus shall not be exposed to dripping or splashing and that no objects filled with
liquids, such as vases, shall be placed on the apparatus.