27. The voltage and frequency of the power supply must comply with
the technical specification of the heater.
28. Clean the surface of the unit with damp cloth (or add some deter-
gent). Do not use corrosive detergent or solvent to clean. Not
allowed to wash directly with water.
29. Do not handle the power cord and plug by wet hands.
30. Do not insert the wood or metal stick or other slim objects into air
inlet or outlet.
31. Regarding the instructions for the installation, thanks to refer to the
below paragraph of the manual.
32. WARNING: Do not use this heater in small rooms when they are
occupied by persons not capable of leaving the room on their own,
unless constant supervision is provided.