Always Use Broan Brand Filters That Are Designed To Work With Your Specific Range Hood. (Ul)(Li)Designed To Fit The Following Series Of Broan Range Hoods: 11000, 40000, F40000, 42000, 46000 And 52000(/Li)(Li)Refer To The Installation Guide Provided With Your Range Hood Or See The Faq Section On This Site For Proper Filter Maintenance And Warranty(/Li)(/Ul)