Parallel blade dampers have blades that move in the same direction, while opposed blade dampers have blades that move in opposite directions. Each type has distinct characteristics that make them suitable for different applications.

Jun 10, 2019 · The opposed blade action can modulate airflow and provide more closing torque for the damper. Tighter seals between each blade will minimize air leakage. Opposed blade orientation is best for modulating airflow at different points in the duct.

Opposed blade dampers allow better control over the entire range of control, whereas parallel blade dampers are better suited for control of ∼70–100% flow. These control dampers are generally installed in the duct by flanges, as shown in Figure VI/3.1-1 c.

Aug 8, 2023 · Unlike parallel blade dampers, opposed to ventilation blades, dampers have a shallower curve with a pronounced slow increase in flow rate, commonly used for volume control modulating air filter applications ranging from wide open 100% open to 25% open.

The VCS3 opposed blade damper provides airflow adjustment at the grille. Volume control blades move simultaneously in opposite directions to provide superior metering and control with minimal disturbance of the air pattern.

Conversely, adjacent blades of a damper with an opposed type linkage turn in opposite directions. These dampers are commonly called opposed blade dampers. This report will focus primarily on the application and installation of rectangular control dampers.

Jan 15, 2025 · The main purpose of opposed blade action is air flow modulation or changing the amount of air moving through the damper. Opposed blades can open to a specific spacing, which restricts or frees the air stream as it moves through the damper. This is excellent for applications that require careful air balancing.

Nov 8, 2018 · Opposed blade dampers are ideal for applications requiring volume control over a broader range, from wide open to 25% of wide open. The arm swing of the opposed damper blades has a more proportional and controlled and damping effect, making the opposed blade configuration better suited for modulating applications.

In this paper, I aim to clarify how parallel blade dampers difer from opposed blade dampers and how each one afects airflow. With a thorough understanding of these basic principals, engineers and specifiers are able to select the most appropriate blade action for …

Jun 1, 2023 · Opposed Blade Damper: The opposed blade arrangement helps in maintaining better flow characteristics across the damper. The opposing blades help to distribute the airflow evenly, reducing turbulence and pressure drops.