These insulated ducts are UL181 and approved for use as a Class 1 air duct.
- R4.2 fiberglass insulation for improved energy efficiency
- Can be used in supply, return and standard exhaust applications
- Not for use in kitchen hood exhaust systems
- Consult your local building codes
Product Contains:
(1) – 4″ x 25′ Insulated Duct – R4.2
