Sharyl D Costa Mesa , CA August 25, 2014 My thermador down draft had a gross filter I ordered replacement filters--the filters fit inside the vent. I did not have a part number, just the model and the size. These fit great! My down draft was installed in 1996, so I was afraid the part might not be available. Success! 10 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes