SMACNA-Sheet Metal and Air Conditioning Contractors National Association
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Sheet Metal and Air Conditioning Contractors National Association (SMACNA)

IHS Markit is your source for SMACNA standards and publications.

Standards, guides, and manuals covering duct work and air conditioning; high-pressure duct construction standards; balancing and adjustment of air distribution systems; energy recovery equipment and systems air-to-air; fibrous glass duct construction standards; HVAC duct system design; etc.