At Mirror Ducts L.L.C., we specialize in residential air duct and dryer vent cleaning. The owner, Sammy, has over five years of experience in the air duct cleaning industry. And he holds a mechanical license in ductwork, following all duct construction standards. Michigan Mechanical Code, SMACNA duct construction standards, and ACCA residential duct design. It is important to ask any duct cleaner making alterations/cut-ins into your ductwork if they are licensed. An NADCA certification does not allow you to make alterations to ductwork in Michigan without a mechanical license.