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- Johns Manville Formaldehyde-free™ fiber glass insulation
- GREENGUARD® certified insulated products
- Galvanized or bronze metal core reinforcing
- Oversized core to fit on collars and register boxes
- Weather-resistant packaging
- Diameter4 inLength25 ftMaterialFiberglassManufacturerQuietflex ManufacturingManufacturer #480CSeries80 SeriesTemperature Rating200 degFTypeRip StopVapor TransmissionAt or Below 0.05 perms