HEPA Filter Cell: Efficiency 99.97% @ 0.3 μm

Component Specifications

Definition

A HEPA filter cell is a critical component within a HEPA filter bank, constructed from a dense mat of randomly arranged borosilicate glass fibers or synthetic media. It operates through a combination of diffusion, interception, and impaction mechanisms to achieve a minimum efficiency of 99.97% in capturing airborne particles with a diameter of 0.3 micrometers. It is a disposable, sealed unit designed for installation in industrial air handling systems to maintain cleanroom conditions, protect machinery, or ensure product purity.

Working Principle

Air is forced through a dense, pleated media. Particles are captured via: 1) Diffusion (Brownian motion for sub-0.1μm particles), 2) Interception (particles follow airstream lines and contact fibers), and 3) Impaction (larger particles cannot follow curved airstreams around fibers and collide with them).

Materials

Primary media: Borosilicate glass microfibers or synthetic materials (e.g., polypropylene, PTFE-coated glass). Frame: Galvanized steel, aluminum, or plastic (ABS, polystyrene). Sealant: Polyurethane, silicone, or hot-melt adhesive gaskets.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Depth	2.75 in, 5.9 in, 11.8 in (standard)
Efficiency	99.97% @ 0.3 μm
Media Type	Glass Fiber or Synthetic
Pleat Count	Varies (e.g., 28-50 pleats/ft)
DOP/MPPS Tested	Yes
Initial Pressure Drop	≤1.0 in w.g. @ rated airflow
Max Operating Temperature	250°F (121°C) for standard glass

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

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

Parent Products

This component is used in the following industrial products

HEPA Filter Bank

A modular assembly of HEPA filters designed to remove airborne particles with high efficiency within air handling systems.

View Product Details

Engineering Analysis

Risks & Mitigation

Media rupture causing contamination
Bypass leakage due to failed gasket seal
Increased pressure drop reducing system airflow
Fire risk if exposed to high temperatures beyond rating
Handling damage (punctures, moisture)

FMEA Triads

Trigger: Excessive differential pressure
Failure: Media rupture or frame collapse
Mitigation: Install pressure gauges/alarms; adhere to max pressure drop specs; use pre-filters.

Trigger: Improper installation or damaged gasket
Failure: Air bypass around cell, efficiency loss
Mitigation: Follow installation torque specs; inspect gaskets; perform in-situ leak testing (DOP/PAO).

Trigger: Moisture ingress or chemical exposure
Failure: Media degradation, loss of structural integrity
Mitigation: Use hydrophobic (PTFE) media for humid environments; specify chemical-resistant materials.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Frame dimensions: ±1/16 in (1.6 mm). Efficiency: Must meet or exceed 99.97% at 0.3 μm MPPS per EN 1822-5 or ISO 29463.

Test Method

Efficiency tested via DOP (Di-Octyl Phthalate) or PAO (Poly-Alpha Olefin) aerosol challenge at MPPS (Most Penetrating Particle Size) per IEST-RP-CC034. Leak testing per IEST-RP-CC006.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of HEPA Filter Cell

Manufacturer profiles associated with HEPA Filter Cell.

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Frequently Asked Questions

What is the difference between a HEPA filter and a HEPA filter cell?

A HEPA filter cell is the core filtration media and frame unit. A HEPA filter bank is the complete assembly housing multiple cells, gaskets, and support structure.

How often should a HEPA filter cell be replaced?

Replacement is based on terminal pressure drop (typically 2x initial drop) or scheduled maintenance per ISO 14644. In critical environments, monitoring and replacement are continuous.

Can HEPA filter cells be cleaned and reused?

No. HEPA filter cells are disposable. Cleaning damages the fragile media, compromising efficiency and integrity. They must be replaced.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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 Filter Cell