The Broan BP4 is an aluminum 10-1/2-Inch replacement hood filter. No one provides more ways to improve indoor air quality. From the spot ventilation and heating products, to our whole-house Broan Fresh Air Systems, trust Broan to keep your home safe and comfortable. Broan filters are made from the highest quality materials to provide the longest life possible and keep your range hood operating at peak performance. Broan also provides replacement filters for many other brands.