calimaero TVE Round Stainless Steel Adjustable Vent Valve 4" Inch 4054503000308

calimaero® TVE 4 inch - Round Stainless Steel Adjustable Vent Valve 100 mm Fits Only with Metal Ducts

LOOTICH Sturdy 4 Inch 8 Feet Non-Insulated Flex Air Aluminum Ducting Vent Hose for HVAC Ventilation 2 Stainless Steel Clamps Included

neverest® ESD 100mm in-line Duct Sound Absorbing Tool Sound Insulation Silencer for Round Ventilation Pipes