Gino C St. Charles , MO August 21, 2015 Appliance: Whirlpool Microwave Hood Combo MH1150XMB0 Whirlpool Microwave Mh1150xmb0: Vent grill on whirlpool microwave broke. How to replace Microwave Vent Grill. Purchased new part from appliancepartsproscom which I received 22 hours after ordering (thanks you). Installation was very simple.removed two screws and reinstalled with new grill. Total time less that 5 minutes. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes