Updated by Ryan
Both UVC and Ozone can have a slight degrading effect on the surface of some materials, similar to the effects of sunlight but much weaker. Keep in mind that the sun shines all day long, but you will operate Uvlizer for only minutes at a time and probably only a few times a week.
Still, if you have precious items like works of art, where it is important to preserve their condition, you should remove such items from a room before operating Uvlizer. In the event that an item cannot be removed, you can completely block the effects of the UVC light by simply covering the item with any material (cardboard, plastic, cloth, paper). This will not completely block the effects of Ozone, however.