What are the safety precautions I should follow when using the HPA8350?

You should never use the air purifier outdoors, near water, in damp locations, or where combustible gases are present. Always turn the unit off and unplug it when not in use, never pull the cord to disconnect it, and do not use the unit if the cord or plug is damaged. The unit must always be used in its upright position and fully assembled. (Page 1)