Ronald K Elburn , IL July 09, 2016 Appliance: KitchenAid Microwave Hood Combination 1.8 Cu. Ft. KHMS1850SSS0 Kitchenaid Microwave Khms1850sss0: Just cleaning microw add ve oven. How to replace Charcoal Filter. Replace the grease znd charcoal filters Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes