Benefits of Thermoflo Black Core 4" Ducting 1100S
- Manufactured with 2-ply laminate commercial grade casing & double sealed core
- Galvanized spring steel helix maintains duct shape and prevents rust
- Oversized to fit easily onto connectors and fans
- Materials are flame resistant and comply with NFPA standards 90A & 90B
- Made in North America with strict quality controls
- Available in 25’
