For ductless application of BBN powerpack inserts, Provides use of an insert in an application where it is not feasible to duct a range hood to an external location, Includes a charcoal filter, a soffit grille, a 90-degree stack boot, a 7 in. round duct and a 6 in. to 7 in round transition, Use with S99010464-124 replacement charcoal filter, Refer to the Installation Guide provided with your range hood or see the FAQ section on this site for proper installation and maintenance