1379W Lambro 4 in x 8 ft Laminated Transition Duct - Louvered Vent KitContains UL Listed laminated transition duct1 - 4" White Plastic Louvered Vent w/ Tail Pipe1 - 4" x 8' Laminated Transition Duct - UL Listed2 - Galvanized Tension Clamps1 - Removable Screen