Rectangular Backdraft Damper

ICEMAC Rectangular Backdraft Damper (IC-BDD Series)

Product Overview
The ICEMAC IC-BDD Series is a gravity-operated, non-motorized damper engineered to maintain unidirectional airflow in ventilation systems. Designed to close automatically under gravity or reverse airflow, it prevents backdrafts and cross-contamination between duct zones. Made entirely from extruded aluminum, the IC-BDD offers long-term durability, silent operation, and maintenance-free performance in supply and exhaust lines.

Key Features

• Gravity-Operated Blades – Passive closure when airflow stops or reverses.

• Lightweight Aluminum Construction – Ensures corrosion resistance and silent operation.

• No Calibration Required – Pre-balanced blades close automatically without manual setting.

• Flexible Sizing – Wide range of rectangular dimensions for seamless duct integration.

Applications

• Exhaust Air Terminals – Prevents outside air, dust, or fumes from re-entering idle ducts.

• Fresh Air Intakes – Blocks reverse airflow in standby supply ducts, especially in windy conditions.

• ERV/HRV Systems – Avoids back-circulation in pressure-sensitive ventilation networks.

• Zoned HVAC Systems – Stops cross-pressure transfer between multi-branch duct systems.

Advantages

• Passive & Reliable – No actuator, sensor, or power supply needed.

• Architectural Compatibility – Optional RAL color finishes match visual and functional requirements.

• Tool-Free Operation – Maintenance-free component for constant or intermittent flow conditions.

• Precise Performance – Factory-calibrated geometry ensures smooth blade movement and air seal.

Technical Specifications