Laureen N Sauquoit , NY December 03, 2018 Appliance: Model MH3184XPB 4 Microwave vent grill fell off (Whirlpool). Easy fix, hopefully the last one! I think the design of the earlier ones needed to be more substantial. The new one had an additional metal clip which was screwed into the housing, Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes