Product review (5 stars): Easy, easy install
As another reviewer wrote, I broke a blade of the original fan while vacuuming cat hair and dust from the coils under my Whirlpool fridge.  Fan then made a terrible noise as it was out of balance.  Used a piece of Gorilla tape to add some weight where the broken blade was an zip-tied the fan frame to the fridge frame to reduce the noise until this arrived.  Super easy install: pull the old blade assembly straight out from the shaft (did not have to remove the motor) sprayed a shot of WD40 in the hole on the new blade assembly and slipped it right on!  Make sure it fully seats on the shaft.  No more helicopter sounds from the fridge!!!