Product review (5 stars): Replaced grease filter in Whirlpool Model No. UXT4230ADS1
This is the correct grease filter for the Model No. UXT4230ADS1 range hood by Whirlpool.  I had a hard time finding the right one.  This is it.  Fits perfectly.  At first, when I installed it, there was a bit of chattering due to vibration.  I turned it 180 degrees, reinstalled it, and there was no more chattering.  These metal components, and the housings into which they fit, tend to have a very slight warp to them, and once it was turned around the warp made the fit secure, which eliminated the chattering.  I am not going to try to clean this in the dishwasher.  I read that this was possible, and I tried to clean the prior one by putting it through the dishwasher, which did not work (the metal became dull and discolored, and it was still dirty).  I might try to clean it by soaking it in a strong cleaner.  Otherwise, when the time comes, I will replace it again.  The first one lasted about one year.  I am happy to have located this product.