Matthew M Scituate , MA November 24, 2021 Appliance: General Electric Microwave PNM1971SR1SS Ge Microwave Pnm1971sr1ss: Went to replace filters for above range microwave vent found out charcoal filter was missing. How to replace Carbon Range Hood Microwave Filter 3-15/16" X 8-3/4" X 3/8". Order part# from owners manual. The part# was wrong. Returned filters. Searched site via model# and found correct filter. Filter looked too large for opening - your support guys explained how it was mounted on an angle. Ordered and installed new filter. Tested today - wife cooking for Thanksgiving. Worked well. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes