Backdraft Vertical Mount 3550-30X20 Specialty Products 951 Series Engineering/Performance Data

951 Series Engineering/Performance Data

2-way reversible door on rectangular sizes

SD52 - Transition Box Spiral Pipe Grille (Single Deflection)

Driftwood Tan

Double deflection radius mount spiral pipe grille with adjustable blades

Backdraft Vertical Mount 3550-30X20 Specialty Products 951 Series Engineering/Performance Datah3. Standard Features * 3550 Vertical mount * 3560 Horizontal mount air up * 3570 Horizontal mount air down * 3580 Round sizes available 5" to 24" * All non motorized backdraft dampers * Dampers are opened by air pressure differential and closed by gravity * 16 gauge channel frame with 26 gauge galvanized blades * Out of airstream linkage * Blades are vee stiffened 26 gauge for strength and stability * Square steel pivot pins * Nylon bushings * Single