• Accredited Quality Contractor - Associated Builders and Contractors, Inc.
    First AQC in the North Alabama region.
  • Safety and Health Management (ISHM)
    Certified Safety and Health Manager (CSHM) on staff.
  • Alabama State Board of Heating, Air Conditioning and Refrigeration Contractors
    State Licensed Contractor.
  • Alabama Plumbers and Gas Fitters Examining Board
    State Licensed Contractor.
  • National Institute for Testing and Certification
    Certified Medical Gas Installer/Brazers.
  • LEED Accredited Professionals
  • Alabama Liquefied Petroleum Gas Board
    State License Contractor

Spiral Ductwork Certification

We have a spiral duct certification from Certaire Technical Services, an independent testing laboratory specializing in the air moving industry. This certification states that our spiral duct meets SMACNA class III leakage requirement for Pressures -2 to +10. Duct sizes include the even sizes between 4”-48” diameter. This certification enables us to use M&D spiral duct on jobs with certification requirements.



1810 Sherman St. S.E.
Decatur, AL 35601

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AL #95034

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