Use HVAC duct support webbing, as an inexpensive alternative to metal straps, to hang HVAC flex duct. Made With Durable polypropylene monofilament webbing.
Duct Strap Hanger - All Round HVAC
FlexRight Durable Elbow Support for Flexible Duct FR-2 - The Home
50 feet Lite Weight Black Nylon Duct Support Webbing Strap Belt 1
Duct Straps
Web Duct Support Strap – Preferred Construction Products
Master Flow 1.75 in. W x 100 yd. Woven Vinyl Hanger Strap HS1.75WV
How to Hang HVAC Ducts United Team Mechanical
Hanging Rectangular Duct with 1″ wide Hanger Strap - Conklin Metal
Oatey Galvanized Hanger Strap in the Pipe Support & Clamps
Duct Insulation R-6.0