CHANTILLY, Va. — The eighth edition of Sheet Metal and Air Conditioning Contractors’ National Association’s (SMACNA’s) Fibrous Glass Duct Construction Standards provides important updates from former editions, with 1400 EI 2-inch board now covered within the standard. This new standard also includes revisions to tie rod reinforcements, channel system reinforcement, partial wrap-around reinforcement, and fasteners associated with the newer boards. Additional provisions for fittings, closures, and specifications referencing the North American Insulation Manufacturers Association (NAIMA) and Underwriters Laboratories (UL) are included.