Repa Market 4'' Inch Metal Duct Connector Flange - Air Tight Vent Duct Collar - for Connecting Exhaust, Intake Flex and Straight Ducting - Heating, Cooling Universal HVAC Adapter - Home, Commercial

Repa Market 4'' Inch Metal Duct Connector Flange - Air Tight Vent Duct Collar - for Connecting Exhaust, Intake Flex and Straight Ducting - Heating, Cooling Universal HVAC Adapter - Home, Commercial

Vent Systems 4'' Inch Galvanized Steel Duct Connector - Round Ventilation Duct Extension - Metal Vent Coupler - Metal Hose Coupling - Galvanised Pipe Connector

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