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Horizontal ducts shall have a support within two feet (0.61 m) of each elbow and within four . DO NOT EXCEED ALLOWABLE OR SPECIFIED LOAD LIMITS. Ductwork support and recommended distance between hangers.This Second Edition of the SMACNA commercial metal and flexible duct construction standards is another MFMA Guidelines for the Use of Metal Framing (Strut Channel) .. 3.7, SPECIFICATION FOR SUPPORTING FLEXIBLE DUCT, 3.19. D. Hanger Spacing: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Table 5-1, "Rectangular Duct Hangers Minimum Size," and Table 5-2, "Minimum Hanger Sizes for Round Duct," for maximum hanger spacing; install hangers and supports within 24 inches of each elbow and within 48 inches of each 8 Feb 2012 Pipe, duct, and equipment hangers and supports. Sheet Metal and Air Conditioning Contractors' National Association, Inc. (SMACNA): Seismic Restraint Manual: Guidelines for Mechanical Systems - latest edition for the "Seismic Restraint Manual: Guidelines for Mechanical Systems." 1. support intervals, and other provisions in SMACNA's "HVAC Duct Construction Standards -. HVAC Duct Construction Standards. Eli P. Howard, III ANSI/SMACNA HVAC-DCS Chapter 11. “Functional Criteria For . Chapter 5. Hangers and. Supports 2 Nov 2018 smacna duct hangers and supports. Fri, 02 Nov HVAC-DCS Hangers and Supports. Chapter 8. Double-Wall. Duct within limits and under. This American National Standard (ANSI/SMACNA 006-2006) contains tables and details for constructing ductwork for ?" to 10" wg positive and negative