Standards governing the design, fabrication, and installation of HVAC duct systems include those of the following organizations:

• North American Insulation Manufacturers Association (NAIMA). Members of this association include the four manufacturers of fibrous glass air duct insulation products.
• Sheet Metal & Air Conditioning Contractors National Association (SMACNA). As the name implies, this association includes companies that fabricate and install air duct systems incorporating fibrous glass insulation products.
• Air Diffusion Council (ADC). This organization includes manufacturers of various classes of flexible duct materials including those which incorporate fibrous glass insulation.
• Midwest Insulation Contractors Association (MICA). This organization is chiefly concerned with mechanical and industrial insulation, but air duct and plenum insulation is included.

I. North American Insulation Manufacturers Association (NAIMA)

a. Fibrous Glass Duct Construction Standard, Fifth Edition, 2002, Publication AH 116

This Standard contains recommended methods of fabricating and installing air handing ducts using fibrous glass duct board material as defined herein. It covers duct board performance criteria, assembly, fabrication, fittings, approved closures, reinforcement, hanging, support and damage repair. This standard was developed using reliable engineering principles and research, plus information obtained from manufacturers, contractors, testing laboratories, and others with specialized experience. A 3-part CSI Masterformat ® specification is included.

b. Fibrous Glass Residential Duct Construction Standard, Third Edition, 2001, Publication AH 119

This Standard is based on the Fibrous Glass Duct Construction Standard cited above, but focuses on recommended methods of fabricating and installing air handling ducts in residential and light commercial structures. A 3-part CSI Masterformat R specification is included.

c. Fibrous Glass Duct Liner Standard, Third Edition, 2002, Publication AH 124

This standard sets forth important properties of fibrous glass duct liner materials, acoustical and thermal performance, contribution to indoor environmental quality, and installation procedures. A 3-part CSI Masterformat R specification is included.

II. Sheet Metal and Air Conditioning Contractors National Association (SMACNA)

a. Fibrous Glass Duct Construction Standards, Seventh Edition, 2003

This standard served as a basis for the scope and content of the above cited NAIMA standard.

b. HVAC Duct Construction Standards, Second Edition, 1995

This standard includes sections on installation of fibrous glass duct liner materials and insulated flexible duct systems.

III. Air Diffusion Council (ADC)

a. Flexible Duct Performance and Installation Standards, Fourth Edition, 2003

This standard sets forth specific methods of classifying, testing, marking, and installing flexible ducts in air distribution systems. It references ADC Test Code FD- 72R1, which establishes values and procedures for testing insulated flexible ducts in terms of air friction loss, acoustical performance, static pressure/ temperature performance, and leakage. Fabrication and installation guidelines are included.

IV. Midwest Insulation Contractors Association (MICA)

a. National Commercial and Industrial Insulation Standards, Fifth Edition, 1999

This standard includes installation and fabrication specifications for fibrous glass duct wrap and duct liner, as well as for rigid fibrous glass exterior board insulation over metal ducts.