I would consider using the full name of the unit on Alta Vista and see what you get. If not much post & tell us, Linda has a "ton" of nuclear search engines downloaded and bookmarked.
Sometimes I feel like if I push the wrong key on my own keyboard, I could become radioactive toast. If Linda keeps progressing, by next week she ought to apply at OakRidge Atomic Research in Knoxville Tennessee. Next thing I know the cursor will shoot me with a laser when I screwup my grammar or miss-spell.
Back to the air cleaner, after turning power off going to it, try oiling it at bearings and moving parts, spray the insides clean with compressed air & check for loose or foreign materials around moving parts, like screws or rivets or wires ETC .
Who sold & installed it? Contact them also.
Edward F Sutton
[This message has been edited by Edward F Sutton (edited December 01, 2000).]