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make sure you keep them free of dust. also check to see if all of the screws that hold it together, the casing, the wire grid, etc, are tight. i've seen the same problem...here and there. i wouldn't call it a widespread problem...but definitely make sure your distributor is aware of the problem you have been having...
once the units are out of warranty, you don't have to buy the entire fan. the plastic casing is sold separately: top fan housing retails at 21.95, same for the bottom. the internal fan is also sold separately for 129.95.
let me know if you need help. teri@fstanning.com.
tb
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