What are the important safety warnings for operating the HPA830?

Always turn off and unplug when not in use; grip the plug and pull from the outlet, never pull by the cord. Do not use outdoors, in damp locations, or where combustible gases are present. Do not block air outlets or intakes, and do not run the power cord under carpets. The unit must be used in upright position and located near an outlet without extension cords. Filters may be harmful if ingested, so avoid breathing dust when changing filters. (Page 2)