Air pressure differential operation enables automatic damper closure for energy efficiency
Non-motorized design eliminates need for external power, simplifying installation
Adjustable counterbalance allows customization of opening pressures for various applications
Vee-stiffened 26-gauge galvanized blades provide strength and stability during operation
Galvanized finish resists corrosion for long-term durability in HVAC environments
Summarized by Shop
h3.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
