Window Duct Kit, Universal Vent Port for 100mm and 150mm Inline Fans, Window Vent Kit Fit HVAC Ducting, Hoses, Duct Fans, Air Conditioner, Grow Tents, Grow Rooms for 4" and 6" Inline Fans

AC Infinity Window Duct Kit, Universal Vent Port for 4” and 6” Inline Fans, Window Vent Kit Fit with HVAC Ducting, Hoses, Duct Fans, Air Conditioner, and Dryer in Homes, Grow Tents, and Grow Rooms

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

AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans