Microlite® EQ FSK duct wrap insulation. It is recommended for HVAC system exteriors or surfaces where design parameters prohibit the use of liner or board. Installing contractors prefer Microlite® EQ’s bio-based binder for many reasons, including improved handling, easier cutting and less dust. Our manufacturing process ensures consistency during production, which results in reliable product quality. Microlite® EQ FSK features an FSK facing for superior thermal and condensation control.