Product review (1 stars): Poor design and  manufacturer assembly
We had this unit install during kitchen remodeling.  The unit started to rust and became very noisy with less then 15 months of use.  The fan impellers unit became separated from the shaft.  A close inspection revealed that it was held in place by pressure and not with a retainer or pin to ensure that it did not come loose during operation.  I agree with other customers, this unit is very poorly made and certainly does not warrant a good review.  One star for the color...