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HEPA/ULPA Filter Component – Computer, Electronic and Optical Product Manufacturing

Component Specifications

Definition

HEPA (High-Efficiency Particulate Air) and ULPA (Ultra-Low Penetration Air) filters are critical components in Fan Filter Units (FFUs) designed for cleanroom and controlled environment applications. These filters capture microscopic particles through a dense mat of randomly arranged fibers, typically made from fiberglass or synthetic materials. HEPA filters must remove at least 99.97% of particles ≥0.3 microns, while ULPA filters remove ≥99.999% of particles ≥0.12 microns. They operate as the final filtration stage in FFUs, ensuring ultra-clean air delivery for sensitive manufacturing processes.

Working Principle

HEPA/ULPA filters operate on three primary mechanisms: interception (particles collide with fibers), impaction (larger particles cannot follow air streamlines and embed in fibers), and diffusion (Brownian motion causes small particles to drift into fibers). The dense fiber matrix creates a tortuous path that traps particles while allowing clean air to pass through. In FFUs, these filters are mounted downstream of pre-filters and fans, providing unidirectional laminar airflow with minimal particle penetration.

Materials

Filter media: Borosilicate glass microfibers or synthetic materials (e.g., polypropylene, PTFE). Frame: Aluminum, galvanized steel, or stainless steel. Sealant: Polyurethane, silicone, or epoxy gaskets. Separators: Aluminum foil, corrugated media, or hot melt adhesive.

Technical Parameters

Dimensions Standard: 610×610×69 mm, 305×610×69 mm
Efficiency HEPA: ≥99.97% @ 0.3μm; ULPA: ≥99.999% @ 0.12μm
Fire Rating UL 900 Class 1 or Class 2
Pressure Drop Initial: 100-250 Pa; Final: 2-3× initial
Humidity Range 0-100% RH (non-condensing)
Airflow Capacity 0.3-0.5 m/s face velocity
Temperature Range -40°C to 80°C

Standards

ISO 29463, ISO 14644, EN 1822, IEST-RP-CC001

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for HEPA/ULPA Filter.

Parent Products

This component is used in the following industrial products

Fan Filter Unit (FFU)

A self-contained air filtration device that combines a fan and HEPA/ULPA filter to provide localized clean air in controlled environments.

View Product Details

Engineering Analysis

Risks & Mitigation

Filter bypass due to improper sealing
Media damage from excessive pressure or moisture
Biological growth in humid environments
Fire hazard if non-rated filters used in critical areas
Performance degradation from clogging

FMEA Triads

Trigger: Improper installation or damaged gaskets
Failure: Air bypass around filter, reducing efficiency
Mitigation: Use proper sealing techniques, conduct integrity testing (e.g., DOP/PAO test) after installation

Trigger: Excessive particulate loading without pre-filtration
Failure: Increased pressure drop, reduced airflow, potential media rupture
Mitigation: Install adequate pre-filters (MERV 8-13), monitor differential pressure regularly

Trigger: High humidity or condensation
Failure: Media degradation, microbial growth, reduced efficiency
Mitigation: Maintain environmental controls, use hydrophobic media if needed, ensure proper drainage

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Filter efficiency must be within ±5% of rated value; frame dimensions within ±1.5mm; pressure drop within ±10% of specified initial value

Test Method

Efficiency testing per ISO 29463 or EN 1822 using particle counters or photometers; integrity testing via DOP/PAO aerosol scan; pressure drop measurement at rated airflow

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between HEPA and ULPA filters?

HEPA filters capture ≥99.97% of particles ≥0.3 microns, while ULPA filters capture ≥99.999% of particles ≥0.12 microns. ULPA filters provide higher efficiency for smaller particles, used in stricter cleanroom classes (ISO 1-3).

How often should HEPA/ULPA filters in FFUs be replaced?

Replacement depends on operating hours, particle load, and pressure drop. Typically, every 3-5 years with proper pre-filtration. Monitor pressure drop; replace when it reaches 2-3 times the initial value or if integrity tests fail.

Can HEPA/ULPA filters be cleaned and reused?

No, these are disposable filters. Cleaning damages the fiber matrix and compromises efficiency. They must be replaced when performance degrades.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

HEPA/ULPA Filter