Performance+® Duct Liner is a flexible, mat-faced insulation bonded with ECOSE Technology. It is faced with a tightly bonded mat to give the airstream a smooth, tough surface, resisting damage during installation and operation. The encapsulant edge coating eliminates airstream flaring. Airstream surface mat facing is treated with an EPA-registered antimicrobial agent to aid in the prevention of fungal and bacterial growth. Provides an optimum combination of efficient sound absorption, low thermal conductivity and minimal airstream surface friction.