2Pack 4 inch Backdraft Damper Duct, One Way Airflow Ducting Insert for Ducting in Range Hoods, Bathrooms Fans and kitchen Fan

MIVIDE 2Pack 4 inch Backdraft Damper Duct, One Way Airflow Ducting Insert for Ducting in Range Hoods, Bathrooms Fans and kitchen Fan

QWORK 4" Duct Splitter, 45° Degree 4 Inch Branch Metal Duct Connector 3 Way Hose Adapter/Splitter

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