I used this material:
Frost King Foam and Foil Duct Insulation
Insulates Aluminum or plastic duct work.
Insulates all types HVAC Ducts
Conforms to sharp corners
Stops vibrations
Seals seams and screw heads
12" x 15" Roll $18.77 per Roll
4 rolls did the floors, under the back seat and also the package tray.
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