Broan 30W in. QP2 Under Cabinet Range Hood Evolution 2 (QP2) series 4-way convertible under cabinet range hood Installation options include ducted 3-1/4 in. x 10 in. (vertical or horizontal), 7 in. round (vertical) and non-ducted Adjustable duct connector accommodates off-center duct work 3-level centrifugal blower provides increased performance and quieter operation (normal, mid, high) Quiet 0.6 sones at normal speed (100 CFM) and 5 sones at high speed (350 CFM)