Mitchell Metal MM-34810 HVAC Ductboard Starting Collar with Crimp

Mitchell Metal MM-34010 HVAC Ductboard Starting Collar

Mitchell Metal MM-31064 Duct Reducer (6"-4")

Mitchell Metal MM-31043 Duct Reducer (4"-3")

Mitchell Metal MM-9166 6" HVAC Flexible Collar Connector

Mitchell Metal MM-3488 HVAC Ductboard Starting Collar with Crimp

Mitchell Metal MM-3486 HVAC Ductboard Starting Collar with Crimp

Mitchell Metal MM-3408 HVAC Safety Tab Starting Collar

Mitchell Metal MM-3406 HVAC Safety Tab Starting Collar

Mitchell Metal MM-2054 4" Adjustable Duct Elbow