Vent Systems 4" in-line Air Vent Duct Coupler for 4 inch Pipe. Straight Inline Ventilation Pipe Plastic Ducting Connector for Cooling Heating Ventilation System HVAC 100 mm

Vent Systems 4" Inch - in-line Air Vent Duct Coupler for 4 inch Pipe. Straight Inline Ventilation Pipe Plastic Ducting Connector for Cooling Heating Ventilation System HVAC 100 mm

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

EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm)