Bought this because it allegedly could be installed in 10 minutes.  I guess that applies to ones made correctly.  None of knockouts could be removed with a flat head screwdriver.  They had to be yanked out with pliers.  The grease filters are too large by about 1/4" and cannot be installed correctly.  Finally, the fan doesn't work correctly.  We'll be on the phone with GE shortly.  Wish we had never purchased it!