【How-to】How do you connect sheet metal ductwork

Hanger Spacing: Comply with SMACNA’s “HVAC Duct Construction Standards – Metal and Flexible,” Table 5-1 (Table 5-1M), “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 …