What safety precautions should I follow when using the HPA8350 Air Purifier?

Always turn the air purifier controls to the OFF position and unplug from the wall outlet when not in use, and never pull the cord to disconnect — always grip the plug itself. Do not use the air purifier outdoors, near water, in damp locations, or where combustible gases are present, and always use the unit in its upright position. (Page 1)