Awenta RM100 x Building material:, standard

4" Inch Pipe Collar Ducting Finishing Rosette Duct Metal Ceiling Valve/Vent Flange Hose Spigot Tube End (Steel, 4")

AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-Feet Long for Heating Cooling Ventilation and Exhaust

AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust