HEPA Filters for Laminar Flow Hoods

Clean-Link supplies HEPA filters for laminar flow hoods, clean benches, laminar airflow workstations, and other controlled-air equipment used in laboratory, electronics, pharmaceutical, biotechnology, cleanroom, and precision assembly applications.

A replacement HEPA filter for a laminar flow hood must match more than the outside dimensions. Efficiency class, rated airflow, pressure drop, filter depth, sealing method, frame construction, and the existing housing all affect how the unit performs.

Clean-Link can support H13 and H14 project requirements, mini-pleat HEPA filter constructions, custom dimensions, aluminum or other rigid frame options, gasket or gel seal configurations, and drawing- or sample-based replacement projects.

Request a Laminar Flow Hood HEPA Filter Quote →

HEPA Filters for Horizontal and Vertical Laminar Flow Hoods

Laminar flow hoods generally direct HEPA-filtered air across a work area in either a horizontal or vertical pattern.

CDC’s BMBL illustrates both horizontal and vertical laminar flow clean benches using supply HEPA filtration. In a horizontal clean bench, filtered air typically moves across the work surface toward the operator side; in a vertical clean bench, filtered air moves downward over the work area.

Clean-Link can support HEPA replacement requirements for both configurations.

Horizontal Laminar Flow Hood HEPA Filters

Horizontal laminar flow units typically place the HEPA filter at the rear of the cabinet so filtered air moves horizontally across the work surface.

Important replacement parameters may include:

• Filter width and height
• Filter depth
• Rated airflow
• Pressure drop
• Frame dimensions
• Gasket position
• Filter face area
• Blower capability
• Existing plenum design

Vertical Laminar Flow Hood HEPA Filters

Vertical laminar flow systems typically position the HEPA filter above the work zone so filtered air moves downward.

Important specifications may include:

• Filter outside dimensions
• Filter thickness
• Airflow requirement
• Pressure drop
• Ceiling or upper-plenum fit
• Gasket or gel seal
• Protective grille
• Frame construction

Laminar Flow Hood vs Biosafety Cabinet

This distinction should be clear when selecting or replacing a HEPA filter.

A laminar flow clean bench is generally designed to provide clean HEPA-filtered air over the work surface. It is primarily intended for product or workspace protection rather than personnel protection. A biosafety cabinet is a different containment device designed around specific personnel, product, and environmental protection requirements.

For this reason, buyers should confirm the actual equipment type before ordering a replacement HEPA filter.

Clean-Link can review:

• Equipment model
• Existing filter photo
• Housing configuration
• Airflow direction
• Filter dimensions
• Application

This helps reduce the risk of specifying the wrong filter for the equipment.

What HEPA Filter Specifications Matter for a Laminar Flow Hood?

For laminar flow equipment, a HEPA filter should be matched to the actual unit and airflow design.

Important specifications include:

H13 and H14 HEPA Filter Options

Clean-Link can support H13 and H14 project requirements for laminar flow hood and clean bench applications.

The correct class should be based on the equipment specification and application rather than selected only by choosing the highest available efficiency.

HEPA filter selection should consider:

• Required efficiency
• Rated airflow
• Pressure drop
• Blower capacity
• Filter face area
• Sealing
• Existing equipment design
• Testing requirements

ISO 29463-1:2024 provides the current international framework for classification, performance, testing, and marking of high-efficiency filters.

Related guide: Understanding HEPA Filter Efficiency

Mini-Pleat HEPA Filters for Laminar Flow Hoods

Mini-pleat HEPA filters are commonly suitable for laminar flow and clean bench equipment because they provide a large media area within a relatively compact filter depth.

This can help designers balance:

• High filtration efficiency
• Airflow
• Filter depth
• Pressure drop
• Compact equipment dimensions

Actual performance still depends on the complete filter design and rated operating airflow.

Related collection: Mini-Pleat HEPA Filters

 

Airflow and Pressure Drop

Airflow is especially important in laminar flow equipment because the hood depends on controlled air movement across or down the work area.

A replacement filter that physically fits but has much higher resistance than the original may affect blower performance and airflow conditions.

Important parameters include:

• Rated airflow
• Filter face velocity
• Initial pressure drop
• Available blower static pressure
• Filter media area
• Filter depth
• Existing prefilter
• Filter loading

A lower pressure drop is not automatically better if the filter does not meet the required efficiency or construction.

The goal is to match the replacement filter to the original equipment’s airflow and resistance requirements.

Related article: Air Filter Pressure Drop

 

Gasket and Gel Seal Options

A HEPA filter can only perform correctly in the system if the air is directed through the filter rather than around it.

Clean-Link can support:

• Upstream gasket
• Downstream gasket
• Full-face gasket
• Foam gasket
• EPDM gasket where applicable
• Gel seal configurations
• Custom gasket position
• Housing-specific sealing requirements

For gel-seal units, the filter gel channel must match the compatible knife-edge housing.

Related collection: Gel-Seal HEPA Filters

Related guide: Air Filter Bypass Leakage

 

Custom HEPA Filters for Laminar Flow Equipment

Many laminar flow hoods use equipment-specific filter dimensions rather than standard HVAC filter sizes.

Clean-Link can manufacture custom HEPA filters based on:

• Length
• Width
• Depth
• Efficiency class
• Rated airflow
• Pressure drop target
• Frame type
• Gasket position
• Gel seal configuration
• Protective grille
• Existing filter drawing
• Existing filter sample

For older or imported equipment, sample matching can be especially useful.

Related page: Custom HEPA Filters

 

Replacement HEPA Filters for Existing Laminar Flow Hoods

Replacing an existing filter should start with the original equipment and filter data.

Useful information includes:

• Equipment manufacturer and model, if available
• Existing filter photo
• Filter label photo
• Actual filter dimensions
• Existing efficiency class
• Airflow specification
• Pressure drop data
• Frame material
• Gasket or gel seal
• Airflow direction
• Quantity

If complete specifications are not available, start with:

Photo + dimensions + equipment application

Clean-Link can help identify what should be confirmed next.

HEPA Filter Testing and Integrity Requirements

High-efficiency filters may require different testing or documentation depending on the equipment and project.

Clean-Link can support discussion of:

• Dimension inspection
• Visual inspection
• Frame and gasket inspection
• Efficiency-related data where applicable
• Airflow resistance data where applicable
• Leakage or scan testing requirements where applicable
• Individual test documentation where applicable
• Drawings and datasheets

ISO 29463 includes filter classification and test methods; Part 4 addresses scan testing for leakage of filter elements, while Part 5 covers test methods for filter elements.

Testing scope should be confirmed before production.

Applications

HEPA filters for laminar flow hoods and clean benches are used in environments where controlled particulate conditions around the work area are important.

Typical applications may include:

• Electronics assembly
• Semiconductor-related work
• Optical component assembly
• Precision mechanical assembly
• Laboratory sample preparation
• Pharmaceutical preparation areas
• Biotechnology workflows
• Cleanroom support equipment
• Medical device component assembly
• Research work involving non-hazardous materials
• Quality-control workstations

For cleanroom environments, ISO 14644-1 provides the broader classification framework for airborne particle concentration in cleanrooms and clean zones.

Prefiltration and HEPA Filter Service Life

Many laminar flow units include an upstream prefilter before the HEPA filter.

A suitable prefilter can help capture larger particles before they reach the HEPA stage.

This can help:

• Reduce HEPA dust loading
• Slow pressure drop increase
• Support longer service intervals
• Protect the main HEPA filter
• Reduce maintenance burden

The prefilter should also be maintained according to equipment and operating conditions.

CDC guidance for clean benches has historically emphasized proper prefilter maintenance as part of system operation.

Related collection: Panel Filters

 

How to Select a HEPA Filter for a Laminar Flow Hood

Before requesting a quotation, confirm as much of the following as possible:

 

 

What to Send for a Quote

For the fastest technical review, send:

• HEPA filter dimensions
• Efficiency class
• Equipment type
• Rated airflow, if available
• Pressure drop, if available
• Frame type
• Gasket or gel seal requirement
• Existing filter photo
• Equipment photo or model
• Quantity

If you do not know the complete specification:

Start with photo + dimensions + equipment application.

Why Choose Clean-Link for Laminar Flow Hood HEPA Filters?

Clean-Link supports replacement and custom HEPA filter projects for laminar flow hoods, clean benches, controlled-air workstations, cleanroom equipment, HVAC systems, and OEM applications.

Our support can include:

• H13 and H14 project requirements
• Mini-pleat HEPA filter options
• Standard and custom dimensions
• Aluminum and other rigid frame configurations
• Gasket and gel seal options
• Airflow and pressure drop review
• Existing sample matching
• Drawing-based production
• Testing and documentation discussion where applicable
• OEM and repeat supply support

For broader HEPA manufacturing capability:

HEPA Filter Manufacturer →

 

Request a Laminar Flow Hood HEPA Filter Quote

Need a replacement or custom HEPA filter for a laminar flow hood, clean bench, or controlled-air workstation?

Send Clean-Link your:

• Filter dimensions
• Efficiency requirement
• Equipment model or photo
• Airflow information
• Pressure drop data, if available
• Seal type
• Current filter photo
• Quantity

If the complete specification is not available, start with:

Photo + dimensions + application

Request a Quote →

 

FAQ

What type of HEPA filter is used in a laminar flow hood?

Many laminar flow hoods use compact or mini-pleat HEPA filters. The exact filter depends on the equipment dimensions, airflow, resistance, sealing arrangement, and required efficiency.

Can Clean-Link supply replacement HEPA filters for laminar flow hoods?

Yes. Clean-Link can review existing filter photos, dimensions, labels, drawings, airflow information, and equipment details to support replacement HEPA filter projects.

Are H13 and H14 filters available for laminar flow hoods?

Clean-Link can support H13 and H14 project requirements depending on the equipment design, airflow, pressure drop, and specification.

What is the difference between a laminar flow hood and a biosafety cabinet?

A laminar flow clean bench primarily provides HEPA-filtered air for the work area or product. It should not be assumed to provide the same personnel or environmental protection as a biosafety cabinet.

Can a HEPA filter be replaced based only on size?

Not ideally. A replacement filter should also match efficiency, airflow, pressure drop, filter depth, frame, sealing method, and equipment design.

Are gel-seal HEPA filters used in laminar flow hoods?

Some equipment may use gel-seal HEPA filters with compatible knife-edge housings. Housing geometry should be confirmed before ordering.

How does pressure drop affect a laminar flow hood?

Higher filter resistance can affect the blower’s ability to maintain the intended airflow. Replacement filters should therefore be reviewed for both efficiency and resistance.

Can Clean-Link manufacture custom sizes?

Yes. Custom dimensions, frame configurations, gasket or gel seal options, efficiency requirements, airflow, and pressure drop targets can be reviewed.

What information is needed for a quote?

Provide filter dimensions, efficiency class, equipment type, airflow and pressure drop if available, seal type, current filter photo, equipment model or photo, quantity, and testing requirements.