Nadia Z Ventnor City , NJ May 08, 2015 Appliance: KitchenAid Microwave KHMS147HBL1 Kitchenaid Microwave Khms147hbl1: Original vent grille broke. How to replace Microwave Vent Grille. Simply installed the new vent grille Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes