Features & Benefits
- Specially formulated fabric sleeve attached to an outer metal sleeve for maximum air flow
- Closes with minimal pressure in the opposite direction
- Non-mechanical in-line one way air flow valve
- Tested to UL 723 and NFPA 255 standards
- Non-restrictive damper that fits inside the duct
- Inexpensive, energy efficient, easy to install in existing duct
- Made in the USA