Maylynn A Granville , ND January 28, 2017 Appliance: Whirlpool Microwave Hood Combo MH1150XMS4 Whirlpool Microwave Mh1150xms4: We lost the microwave vent and when we found it it was broken. How to replace Microwave Vent Grille. We ordered a new one and received it 3 1/2 days later. Thank you for the speedy delivery. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes