
Quietflex®
1840 40 Series Rip Stop Flex Duct With R 4.2 Insulation, 18 in Dia, 25 ft L, 6000 fpm, Fiberglass
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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
- Diameter18 inFlow Rate6000 fpmLength25 ftMaterialFiberglassFinishSilverManufacturerQuietflex ManufacturingManufacturer #1840Series40 SeriesTypeRip StopVapor TransmissionAt or Below 0.05 perms