24x48 Inch THERMOPAN Joist Liner

For constructing return air duct between joist and stud cavities. Corrugated insulation faced with aluminum. A high quality sheet metal alternative Reduces duct noise Air space provides positive R-value. Stapling as directed results in a tight plenum air seal. Enviro-friendly Made from recycled products. Moisture treated against dampness. All popular joist size. Will not sustain combustion.