The DFD35SS/OW is a UL555 classified, 1 1/2 hour rated, multiblade fire damper designed for use in "out of wall or concrete floor" through penetration applications.
The DFD35SS/OW features:
- UL approval for dual directional air flow.
- Maximum velocity of 2,000 fpm.
- Maximum 4" static pressure.
- Stainless steel construction.