Pre Filter
Pre-filter is the first-stage air filter used in HVAC systems, cleanrooms, and air purification equipment to remove large airborne particles before the air reaches finer filters like HEPA or ULPA filters.
Key points:
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Captures dust, lint, hair, pollen, insects, and other coarse particles
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Typically rated G1–G4 (EN 779) or MERV 1–8 (ASHRAE)
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Made from synthetic fiber, fiberglass, or nonwoven media
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Installed upstream of medium or high-efficiency filters
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Extends the service life of HEPA/ULPA filters and reduces system maintenance
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Improves airflow stability and lowers operating costs
How does it work ?
A pre-filter works by physically trapping large airborne particles as air flows through the filter media.
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Air is drawn through coarse filter fibers
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Large particles like dust, hair, and lint are captured by interception and impaction
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Cleaner air then passes to HEPA or ULPA filters for fine particle removal
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This reduces dust loading on high-efficiency filters and extends their service life
Key Benefits
? First Line of Defense
Traps dust, sediment, debris, and large contaminants before they cause damage.
? Longer Filter Life
Reduces replacement frequency of your main filter—lowering operating costs.
? Improved Performance
Cleaner input means smoother operation and better system output.
? Easy to Install & Maintain
Designed for quick installation and simple cleaning or replacement.
Applications
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Cleanrooms
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FFU (Fan Filter Units)
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AHU & HVAC systems
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Air purifiers
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Industrial ventilation systems
In short, a pre-filter acts as a protective barrier, ensuring downstream filters work efficiently and reliably.
Metal frame Pre filter
Pre filter
