Broan Non-Duct Kit for B58 Model Range Hoods for Lowe's is a specially designed kit that allows you to convert your B58 model range hood for non-ducted operation. This kit includes a non-duct plenum, collar, a 6-inch diameter flexible aluminum duct approximately 48 inches long, two 21.5-inch tie wraps, two non-duct filters, and all necessary hardware. use Broan brand parts to ensure compatibility and optimal performance with your specific range hood. This kit provides an easy and efficient solution for venting your range hood without the need for external ductwork. Model Number: