Opposing Blade Dampers

Knape Associates provides opposed blade dampers from various top manufacturers allow precise airflow control without changing duct direction. The damper blades fit tightly into duct openings. Adjustment is simple with a basic screwdriver.

Precision Control

Opposed blade construction provides superior airflow modulation from fully open to 25% open. The damper blades have a smooth, proportional effect on volume. This makes opposed blade models ideal for applications requiring precise control across a wide operating range.

Easy Integration

These non-directional dampers install seamlessly into any ductwork. Overall length and width are slightly less than the duct size for a streamlined fit. Standard depth is 2-1/8” to accommodate most applications. Custom sizing is available for non-standard ductwork.

Reliable Operation

Quality opposed blade dampers feature durable extruded aluminum frames with rollformed aluminum blades. The blades pivot smoothly on non-loosening nylon pins for rattle-free operation. This robust construction allows reliable modulation in real-world environments.

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Watch to see the difference between opposing vs parallel blade dampers

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Parallel Blade Dampers

Parallel blade dampers provide rapid, on-demand airflow for heating, ventilation, and air conditioning systems. As the damper actuates, the uniformly oriented blades open simultaneously to allow air to flow unimpeded.

This straight-through design makes parallel blade models well-suited for applications requiring quick temperature changes, intermittent strong air bursts, or open/close modulation.

Typical uses include freezer cooling, industrial oven ventilation, HVAC throttling, zone control, laboratory exhaust management, or anywhere where fast actuation and fluid direction are needed.

With robust construction and responsive action, parallel blade dampers offer versatile airflow modulation across diverse environments.

Specifications

Available sizes range from 4” x 4” to 96” x 48”
Standard construction is an aluminum frame with roll-formed aluminum blades
Blades pivot smoothly on nylon bushings without rattling
Dimensions are 1/8” undersized for tight duct fit
Depth is consistently 2-1/8” across all sizes
Handles temperatures between -40°F to 200°F

Airflow Control

Our parallel blade models modulate airflow rates quickly, making them ideal for:

Open/close and two-position applications
Controlling air volumes from 100% down to ~75% open
Rapid temperature adjustment
Intermittently directing strong air bursts

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Opposing vs Parallel Blade Damper Key Takeaways

In summary, parallel and opposed blade dampers each offer distinct airflow control characteristics.

Parallel blade models open concurrently to allow rapid, unrestricted air passage ideal for fast temperature changes or directing intermittent air bursts.

Opposed blade dampers seal tighter and enable smoother, more precise air modulation from fully open to partially closed.

When selecting a damper, consider whether responsive flow direction or exact flow regulation is more important.

With decades of expertise, our team can help determine optimal blade orientation for your application’s priorities and performance requirements.

Supplying Dampers and Louvers

Knape Associates can provide fast quotes on the correct products for your application.

We are official representatives of ventilation products that covers Texas and beyond.

We can also send out a trained specialist to assess the area and make sure the proper equipment is being used for your specific application.