Door Closers Corbin Russwin door closers are designed to withstand high traffic with cases made of cast iron or cast aluminum meeting ADA requirements and fire code compliance. DC3000 Series Cast Iron Door Closer DC5000 Series Cam Action Door Closer DC6000 Series Cast Iron Door Closer DC8000 Series Heavy-Duty Door Closer DC46900 Series Safeguard Door Closers DC62900 Series Electromechanical Closer-Holder