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Passage Air Shower: Enhancing Cleanroom Contamination Control

A passage air shower also known as an air shower tunnel is a self-contained unit designed to remove particulate contaminants from personnel and objects before entering or exiting a cleanroom environment It acts as a highly efficient and effective barrier to prevent external contaminants from infiltrating the cleanroom.

Passage Air Shower: Enhancing Cleanroom Contamination Control

How does a Passage Air Shower Work?

A passage air shower operates by generating a high-velocity, filtered air stream that is released from nozzles strategically placed within the shower walls and ceiling. When a person or object enters the air shower, the air stream creates a turbulent airflow, dislodging and removing loose particles from the surfaces. High-efficiency particulate air (HEPA) filters clean the air before recirculation, ensuring a continuous supply of clean air within the shower.

Importance of Passage Air Showers in Cleanrooms

Passage air showers are vital components of cleanroom contamination control for several reasons. Firstly, they minimize the introduction of contaminants carried on personnel or objects into the cleanroom environment, thereby preserving the integrity of sensitive processes and products. Secondly, passage air showers help maintain the required cleanliness levels, enhancing overall cleanroom performance. Lastly, they contribute to the safety of cleanroom operators by reducing the risk of exposure to hazardous substances.

Benefits of Using Passage Air Showers

The utilization of passage air showers offers numerous benefits for cleanroom operations. These include:

Enhanced Contamination Control: Passage air showers effectively remove particles and debris from personnel and objects, preventing cross-contamination between cleanroom zones and minimizing the risk of defects in products.

Improved Cleanroom Efficiency: By reducing the number of contaminants introduced into the cleanroom, passage air showers help maintain optimal cleanliness levels, allowing processes to run smoothly and efficiently.

Cost Savings: Passage air showers minimize the need for frequent cleanroom maintenance, extend the lifespan of filters, and reduce the risk of contamination-related product recalls, resulting in significant cost savings.

Operator Safety: Passage air showers provide an additional layer of protection for cleanroom operators by removing potentially hazardous particles from their clothing and bodies, reducing the risk of workplace incidents.

Regulatory Compliance: The implementation of passage air showers demonstrates a commitment to meeting industry and regulatory cleanliness standards, ensuring compliance with various quality and safety guidelines.

Design and Components of Passage Air Showers

Passage air showers consist of various components designed to facilitate effective decontamination. These include:

Enclosure Structure: Passage air showers feature a chamber constructed from durable materials, such as stainless steel, with interlocking doors to prevent simultaneous access from both sides.

Airflow System: High-velocity air nozzles, strategically positioned within the shower, create a unidirectional airflow pattern, dislodging particles and guiding them toward the filtration system.

HEPA Filters: HEPA filters trap airborne particles as small as 0.3 micrometers with an efficiency of 99.97%, ensuring the recirculated air remains clean and particle-free.

Control Panel: Passage air showers are equipped with user-friendly control panels that allow operators to adjust shower duration, airflow velocity, and other settings according to specific cleanroom requirements.

Installation and Maintenance of Passage Air Showers

Proper installation and regular maintenance are crucial for the optimal performance and longevity of passage air showers. During installation, it is essential to ensure proper positioning, alignment, and calibration of airflow patterns. Routine maintenance includes filter replacements, calibration checks, and periodic cleaning of the enclosure and nozzles. Compliance with manufacturer guidelines and scheduled service visits by trained professionals are vital for maintaining the effectiveness of passage air showers.

Factors to Consider When Choosing a Passage Air Shower

When selecting a passage air shower for a cleanroom facility, several factors should be considered:

Cleanroom Classification: The desired cleanliness level of the cleanroom will dictate the air shower's specifications, such as airflow velocity, filtration efficiency, and shower duration.

Foot Traffic and Throughput: The anticipated number of personnel and objects passing through the air shower per unit of time should be taken into account to ensure efficient decontamination and prevent overcrowding.

Space Constraints: The available space within the cleanroom should be carefully evaluated to determine the appropriate dimensions and configuration of the passage air shower.

Customization Options: Some manufacturers offer customization options to accommodate specific requirements, such as additional access control features, material compatibility, or integration with existing cleanroom systems.

Common Applications of Passage Air Showers

Passage air showers find applications in various industries and cleanroom environments, including:

Pharmaceutical and Biotechnology: Passage air showers are crucial for maintaining sterility and preventing cross-contamination in pharmaceutical production, research laboratories, and cleanrooms dedicated to biotechnology applications.

Semiconductor Manufacturing: Cleanrooms used for semiconductor fabrication require passage air showers to minimize the introduction of microscopic particles, ensuring high-quality and defect-free electronic components.

Aerospace and Defense: Passage air showers play a vital role in aerospace and defense cleanrooms to prevent the transfer of contaminants that could compromise the performance and reliability of sensitive equipment.

Medical Device Manufacturing: Passage air showers are utilized in cleanrooms dedicated to the manufacturing and assembly of medical devices to ensure product safety, hygiene, and compliance with regulatory standards.

Challenges and Limitations of Passage Air Showers

While passage air showers offer significant benefits, it is important to consider their challenges and limitations. These include:

Human Factor: The effectiveness of passage air showers relies on proper usage and compliance from personnel, including wearing appropriate cleanroom attire and following decontamination protocols.

Large Objects: Passage air showers may have size limitations, making it challenging to decontaminate bulky equipment or objects that cannot fit through the shower chamber.

Noise and Airflow Disruption: The high-velocity air stream generated by passage air showers can produce noise and disrupt airflow patterns within the cleanroom, requiring careful design considerations.


Passage air showers serve as indispensable tools in cleanroom contamination control, contributing to enhanced product quality, process efficiency, and operator safety. By effectively removing particulate contaminants from personnel and objects, these air showers minimize the risk of cross-contamination and maintain the desired cleanliness levels within cleanroom environments. With ongoing advancements and customization options, passage air showers continue to play a critical role in meeting the ever-increasing cleanliness requirements of various industries.


Are passage air showers suitable for all cleanroom classifications?

Passage air showers can be customized to meet different cleanroom classifications and desired cleanliness levels. Manufacturers provide options for airflow velocity, filtration efficiency, and other specifications to match specific requirements.

Do passage air showers eliminate all types of contaminants?

Passage air showers are effective in removing loose particles from personnel and objects. However, they may not eliminate gaseous contaminants or contaminants that are firmly adhered to surfaces. Additional decontamination methods may be required for specific applications.

Can passage air showers accommodate large equipment?

Passage air showers have size limitations, and it may be challenging to decontaminate large equipment or objects that cannot fit through the shower chamber. Alternative decontamination procedures should be considered in such cases.

How often should passage air shower filters be replaced?

The frequency of filter replacements depends on several factors, including the cleanroom classification, the level of particulate contamination, and the manufacturer's recommendations. Regular maintenance and monitoring of filter efficiency are essential to ensure optimal performance.

Can passage air showers be integrated with access control systems?

Yes, passage air showers can be integrated with access control systems to enforce proper cleanroom attire, control personnel entry, and maintain a traceable record of individuals entering or exiting the cleanroom.

Kwang Purification is proud to offer examples of a variety of our air shower projects below.  Air Shower Installation,  Roll Door Cargo Air Shower,  Single Person Single Blowing Air Shower,  Air Shower in Food Industry,  Air Showers and Pass Thrus,  Dust-Free Air Shower Room,  Clean Workshop Air Shower.

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