Judy B Tiburon , CA January 15, 2018 Very old hood filter The filter fit, and does the job. It's hard to gauge the size of the filter from the old one, but the hood housing itself has a width of 35 3/4 (to fill a 36 inch opening). The interior holder for the filter has an outside measurement of 18.5 inches which widens to 19 3/4 at the top and a vertical rise of 2 7/8". The filter slides up into clips on the sides Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes