From the Manufacturer
Broan’s Quiet Hood Convertible Range Hood has a patented air chamber design that significantly reduces noise up to 40 percent over comparable, conventional hoods. Features include: Three ducting options: 3.25-Inch by 10-Inch, horizontal or vertical discharge; 7-Inch round, vertical discharge or Non-ducted, using BPQTF filter (sold separately). Infinite, [...]