Cambridge duct support webbing black 1 3/4 inch width 300 feet length Cambridge duct support webbing is designed for hanging HVAC flexible ducts; 440 Lb average tensile strength, premium quality polypropylene After attaching the webbing to a support beam with nails or staples simply string ducts through the webbing Cambridge duct support webbing is durable easy to use economical and UL classified Cambridge performance driven and high quality products are preferred by industry leaders Cambridge duct support webbing black 1 3/4 inch width 300 feet length. Cambridge duct support webbing is designed for hanging HVAC flexible ducts; 440 Lb average tensile strength, premium quality polypropylene. After attaching the webbing to a support beam with nails or staples simply string ducts through the webbing. Cambridge duct support webbing is durable easy to use economical and UL classified. Cambridge performance driven and high quality products are preferred by industry leaders.