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Major Components of Your Dust Collection System?
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Dust Collection Guidelines
Collection Hoods
Collection hoods are the entrance to your dust collector system. Ensuring they are working efficiently is paramount. Use the guidelines below to size, place, and tune hoods for performance and filter life.
Airflow Circulation
If the capture velocity is too high at the collection hood, excessive particulates are driven into the dust collector and toward the filters. This leads to heavier dust loading than designed, accelerating filter wear and demanding more cleaning energy.
Why “too high” hurts performance
- Unnecessary fines enter the collector, raising pressure drop faster.
- Filters clog sooner → more pulse cleaning → higher energy use.
- Shorter filter life increases operating cost and downtime.
Capture vs. Duct Velocity
Capture Velocity
The air speed at the hood opening that overcomes opposing currents and draws dust into the hood.
Duct Velocity
The air speed inside the ductwork used to keep particles entrained and moving.
Aim for a duct velocity equal to or slightly greater than the minimum needed to convey the dust. Combine this with flow patterns and capture velocity that control dusting without over-collecting fines.
Recommended Velocity Range
1 – 15 m/s (≈ 200 – 250 fpm at hood opening)
Keep hoods enclosed to prevent excessive outside air being pulled into the system.
| Parameter | Where measured | Purpose |
|---|---|---|
| Capture velocity | At hood opening | Overcome ambient currents and draw dust into the hood |
| Duct velocity | Inside ductwork | Maintain particle conveyance and prevent settling |
Common Checklist for Hood Efficiency
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Design and locate collection hoods properly near dust sources.
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Ensure area around hoods is enclosed and tight to improve suction.
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Maintain the correct hood opening size to achieve capture velocity.
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Install and adjust blast gates to balance system airflow.
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Monitor and fine-tune each hood for proper capture and duct velocities.
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Keep hoods capable of handling 1–15 m/s (200–250 fpm) and properly enclosed.
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Check filters regularly and avoid excessive dust loading from high velocities.
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Regularly inspect ductwork to prevent leaks and maintain smooth airflow.
Frequently Asked Questions
What happens if capture velocity is too high?
When capture velocity is excessive, too many particulates are pulled into the collector, increasing filter load and energy use. Filters wear out faster and the system efficiency drops. Always balance airflow according to dust type and hood design.
How can I ensure my hood operates efficiently?
- Design and position hoods near dust sources to reduce air resistance.
- Enclose hood areas tightly to prevent air dilution.
- Install and adjust blast gates for balanced airflow.
- Regularly measure capture velocity and adjust fan speed if necessary.
- Inspect filters and ducts periodically to maintain smooth flow.
What’s the ideal velocity for different materials?
Light dusts such as wood require lower velocities (~10 m/s), while heavier materials like metal or abrasive dusts may need up to 15 m/s. Always refer to your material handling guide for precise requirements.
Domnick (Thailand) is here to help. Whether you’re in the early stages of planning your clean air filtration system for a new facility or considering an upgrade or expansion of your existing setup, our team of Air Filtration and Collector System design experts is ready to assist you.
