Matt M Clearwater , FL April 20, 2020 Appliance: Whirlpool 1.8 Cu Ft Microwave MH3184XPB4 Whirlpool Microwave Mh3184xpb4: The vent got brittle- it broke. How to replace Vent Grille. Bought a new one from A.P.P. and replaced it. I do like that it had a extra clip with it, but I had to modified it to work. It did work though. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes