M&M Manufacturing, Flex Duct Support, MP-FDS Series, Steel, Galvanized, For HVAC, 20 in L x 5-1/2 in W x 2-1/4 in D The MP-FDS Series Flex-Duct Supports are available in 4 sizes;2 1/4¿ wide by 20¿ and 30¿ long;5 1/2¿ wide by 20¿ and 30¿ long. All supports are packaged 25 per carton.
Standard/Approvals: ASTM-A653 CS B