HEPA Unit with H14 HEPA Filter - High Efficiency Air Purification from China Suppliers & Factory
🏭 Application Area
🔬 Electronics Industry
💊 Pharmaceutical & Bioengineering
🏥 Healthcare
🥛 Food & Beverage
🧪 Scientific Research
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Electronics Industry: Semiconductor chip fabrication rooms, LCD panel production lines, precision PCB assembly rooms.
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Pharmaceutical and Bioengineering: Sterile preparation areas, vaccine production lines, Bio Safety Laboratories (BSL-2/3), sterile filling lines.
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Healthcare: Hospital operating rooms, sterile wards, ICUs, bone marrow transplant wards.
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Food and Beverage: Aseptic packaging areas, probiotic production zones, dairy product fermentation rooms.
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Scientific Research: Animal laboratories, microbiology labs, precision instrument rooms.
🔧 HEPA Unit Structure
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Casing: Usually made of cold-rolled steel plate with powder coating or stainless steel, used to house the filter and the plenum box.
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Plenum Box: An empty chamber inside the casing, located above the filter. Its functions are:
▸ Pressure Equalization: Converts velocity pressure from the duct into static pressure, ensuring airflow passes uniformly through the entire surface of the high-efficiency filter media, preventing uneven airflow distribution.
▸ Velocity Reduction: Stabilizes airflow and reduces turbulence.
▸ Pressure Equalization: Converts velocity pressure from the duct into static pressure, ensuring airflow passes uniformly through the entire surface of the high-efficiency filter media, preventing uneven airflow distribution.
▸ Velocity Reduction: Stabilizes airflow and reduces turbulence.
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High-Efficiency Particulate Air (HEPA) Filter: This is the core component, typically a HEPA filter.
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Diffuser Panel: Installed at the air outlet, usually made of aluminum or plastic. It has regularly arranged holes or slots. Its functions are:
▸ Further Airflow Equalization: Ensures clean air is delivered as vertical laminar flow or uniform turbulent flow.
▸ Filter Protection: Prevents objects from directly touching the expensive HEPA filter core.
▸ Further Airflow Equalization: Ensures clean air is delivered as vertical laminar flow or uniform turbulent flow.
▸ Filter Protection: Prevents objects from directly touching the expensive HEPA filter core.
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Damping Layer: Some designs include a perforated plate or damping mesh inside the plenum box to assist with airflow distribution.
⚡ The Efficiency of HEPA Filter
HEPA
≥ 99.97%
Filtering efficiency for particles ≥ 0.3 μm. Standard for cleanrooms, operating rooms, and pharmaceutical environments.
ULPA
≥ 99.999%
Higher-grade filter for particles 0.1–0.2 μm. Used in ultra-high standard fields like semiconductors and bio safety laboratories.
⏳ Service Life of Filters
As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced. The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.
📐 Product Structure Description
💨 Wind Speed Relationship Diagram
📊 Technical Parameters
ⓘ Remarks: (1) Initial resistance tolerance of ± 10% (2) Support customer size
❓ Frequently Asked Questions (FAQ)
Q
What is a HEPA Fan Filter Unit (FFU) and how does it work?
A HEPA Fan Filter Unit (FFU) is a self-contained air filtration device that integrates a fan motor and a HEPA (or ULPA) filter within a single casing. It draws in ambient or recirculated air, forces it through the high-efficiency filter media, and delivers clean laminar airflow downward into the controlled environment. The built-in plenum box equalizes air pressure before it passes through the filter, ensuring uniform airflow distribution across the entire filter surface.
Q
What is the difference between a HEPA filter and a ULPA filter?
A HEPA filter achieves a minimum filtration efficiency of 99.97% for particles ≥ 0.3 μm, making it suitable for most cleanroom, pharmaceutical, and medical applications. A ULPA filter offers a higher efficiency of ≥ 99.999% for particles as small as 0.1–0.2 μm, and is used in ultra-critical environments such as semiconductor fabrication and biosafety level laboratories where even the smallest particles must be controlled.
Q
How often should the HEPA filter in an FFU be replaced?
The service life of a HEPA filter depends on the operating environment, airflow rate, and the concentration of airborne particles. As dust accumulates, the filter resistance increases. Replacement is required when resistance reaches an unacceptable level that reduces airflow efficiency, or when there is a risk that captured dust particles may dislodge and re-enter the airstream. Regular monitoring of differential pressure across the filter is recommended to determine the optimal replacement schedule — typically every 3 to 5 years in standard cleanroom applications.
Q
What industries commonly use HEPA Fan Filter Units?
HEPA Fan Filter Units are widely used across a broad range of industries that require strict contamination control. Key industries include electronics manufacturing (semiconductor chip fabrication, LCD panel production, PCB assembly), pharmaceutical and bioengineering (sterile preparation, vaccine production, BSL-2/3 laboratories), healthcare (operating rooms, ICUs, sterile wards), food and beverage production (aseptic packaging, probiotic and dairy manufacturing), and scientific research (microbiology labs, animal facilities, and precision instrument rooms).
Q
What is the function of the diffuser panel in an FFU?
The diffuser panel is installed at the air outlet of the FFU, typically made of aluminum or plastic with regularly arranged holes or slots. It serves two key purposes: first, it further equalizes the airflow exiting the HEPA filter to ensure clean air is delivered as smooth vertical laminar flow or uniform turbulent flow into the controlled zone; second, it acts as a physical barrier to protect the delicate and expensive HEPA filter core from direct contact with objects or personnel in the room.
Q
Can HEPA Fan Filter Units be customized to specific dimensions or requirements?
Yes, HEPA Fan Filter Units can be manufactured to custom dimensions to suit specific cleanroom ceiling grid configurations, airflow requirements, and installation conditions. The casing is available in cold-rolled steel with powder coating or stainless steel to match different environmental and hygiene standards. Custom sizing is supported, and the initial resistance tolerance is maintained at ± 10% to ensure consistent performance across all units.