https://www.ebay.com/sch/i.html?_nkw=3M+Silver+Fire+Barrier+Plenum+Wrap&_sacat=0&_dmd=2

3M Silver Fire Barrier Plenum Wrap

Regular price
$369.00
Sale price
$263.00

Firestop Plenum Wrap, Height 1/2 In, Width 24 In, Length 50 ft, Cable Trays, Cables, Ducts, Metal Pipe, Plastic Pipe, Silver, Material Inorganic Fiber, Standards UL 1887, Fire Barrier Plenum Wrap