Speedi-Products SM-RH3106 NB 3.25-Inch W by 10-Inch Length to 6-Inch Stack Range Hood 90-Degree Boot 90 Degree Boot style Galvanized 30 Gauge Sheet Metal 3 25-Inch x 10-Inch with crimped 6-Inch diameter pipe collar connection Seal joints with approved duct mastic sealants Consult your local building codes for approved installation practices