Air Shower Manufacturer: What to Check Before You Compare Quotes

How to Evaluate Air Shower Manufacturers, Compare Technical Specifications, and Avoid Hidden Equipment Costs

Most air shower quotations look similar at first glance. They may show the same chamber design, nozzle velocity of 20–25 m/s, H13 HEPA filters, and stainless steel construction.

However, important differences are often hidden inside the equipment. Nozzle geometry, air distribution, fan selection, interlock logic, door mechanisms, and filter sealing can significantly affect the actual performance and service life of an air shower.

For cleanroom contractors, pharmaceutical manufacturers, medical device companies, and industrial buyers, choosing an air shower manufacturer should involve more than comparing prices and product photographs.

This guide explains what to check when evaluating an air shower supplier, which technical specifications to include in an RFQ, and how to compare quotations on an equivalent basis.

1. Understand What an Air Shower Manufacturer Controls

An air shower is designed to remove loose particles from personnel, garments, or equipment before they enter a controlled environment.

High-velocity filtered air is directed through strategically positioned nozzles. The dislodged particles are then captured by the filtration and air circulation system.

However, an air shower manufacturer does not independently determine the cleanliness classification of the entire cleanroom.

The cleanroom designer is responsible for the overall environmental requirements, including:

Cleanroom classification and particle limits.

Pressure differentials between adjacent rooms.

Airflow distribution and air-change requirements.

Personnel gowning procedures.

Equipment layout and personnel movement.

The manufacturer is responsible for the equipment's construction, filtration, airflow distribution, controls, and mechanical performance.

Understanding this distinction helps buyers evaluate suppliers based on what the equipment can actually deliver.

2. Five Critical Components to Evaluate in an Air Shower

Before comparing quotations, pay particular attention to five areas that directly influence equipment performance.

2.1 Nozzle Geometry and Airflow Distribution

Nozzle design affects how effectively high-velocity air reaches different areas of the user's body.

Ask the manufacturer to provide:

Total nozzle quantity.

Nozzle diameter and internal geometry.

Nozzle distribution on side walls and ceiling.

Adjustable nozzle angles, if applicable.

Air velocity measurement location.

Airflow uniformity across the chamber.

A specification stating 20–25 m/s is incomplete unless the supplier identifies where the velocity is measured.

For example, nozzle exit velocity is not equivalent to air velocity measured inside the chamber or at the HEPA filter face.

Request the measurement method and test conditions before comparing performance figures.

2.2 Plenum Design and Fan Selection

The plenum distributes filtered air to the nozzles.

A properly designed air distribution system helps maintain more consistent airflow throughout the chamber.

Ask whether the equipment includes:

A properly designed air distribution plenum.

Diffuser or flow-balancing components where required.

A fan selected for the actual system resistance.

Defined airflow and static pressure operating conditions.

Accessible fan and motor maintenance components.

Do not compare fan ratings based only on motor power or free-air volume.

The more useful information is the fan's operating performance at the required system resistance.

2.3 Interlock System and Controller Logic

The interlock system prevents both doors from opening simultaneously during normal operation.

A controller-based system should have clearly defined operating sequences and failure responses.

Check the following:

Automatic door interlocking.

Adjustable shower cycle time.

Door status indication.

Emergency release arrangements.

Behaviour during power failure.

Fault indication and recovery procedures.

Ask the manufacturer to demonstrate the control sequence rather than simply confirming that an interlock function is available.

The emergency release arrangement should also comply with the applicable building, fire, and life-safety requirements.

2.4 Door Structure and Mechanical Performance

Door construction influences equipment reliability, operational noise, and maintenance requirements.

Important evaluation points include:

Door material and thickness.

Door frame construction.

Closing mechanism and damping.

Gasket design.

Door alignment.

Manual release arrangements.

Compatibility with personnel or trolley movement.

For trolley-type air showers, check the clear opening dimensions and threshold height.

A chamber that looks sufficiently large in a product photograph may not accommodate the actual trolley used at the facility.

2.5 HEPA Filter Installation and Sealing

A filter's efficiency rating does not independently demonstrate the filtration performance of the complete air shower.

The installation frame, gasket, clamping mechanism, and sealing arrangement also matter.

Ask for:

HEPA filter classification.

Filter manufacturer and model.

EN 1822 test documentation, where applicable.

Individual filter integrity or leak-test documentation.

Filter installation and replacement instructions.

Pre-filter configuration and maintenance access.

H13 and H14 are commonly specified HEPA filter classes. The appropriate selection depends on the project requirements and filtration design.

A supplier should explain the proposed filter configuration instead of automatically recommending the highest available class.

3. Air Shower Manufacturer RFQ Checklist: 14 Specifications to Compare

One of the most effective ways to compare manufacturers is to send the same technical requirements to every supplier.

The following RFQ checklist provides a consistent basis for evaluating equipment specifications, manufacturing quality, and delivery requirements.

3.1 Technical Specifications and Evaluation Criteria

3.2 Why Standardized RFQs Matter

A quotation that only states the chamber dimensions, filter class, and motor power does not provide enough information for a meaningful technical comparison.

For example, two suppliers may both quote an SS304 air shower with H13 HEPA filtration.

However, one may provide:

A documented nozzle layout.

Defined airflow measurement conditions.

A controller-based interlock.

Accessible pre-filter replacement.

Filter integrity documentation.

The other may provide only basic product specifications.

These are not necessarily equivalent equipment configurations.

Requesting the same fourteen specifications from every manufacturer makes differences in design, quality, documentation, and price easier to identify.

4. Common Differences Between Low-Cost and Engineered Air Showers

A lower quotation does not automatically mean lower quality. However, buyers should understand which design and manufacturing details may account for significant price differences.

The following table identifies areas worth checking during supplier evaluation.

4.1 Look Beyond the Stainless Steel Grade

Many manufacturers advertise SS304 stainless steel construction.

However, the material grade alone does not describe the complete manufacturing quality.

Buyers should also examine:

Actual sheet thickness.

Internal surface finish.

Weld quality.

Corner construction.

Surface treatment.

Accessibility for cleaning.

For pharmaceutical and other hygiene-sensitive environments, smooth internal surfaces and accessible cleaning areas are particularly important.

4.2 Check the Complete Filtration Assembly

A HEPA filter can meet its specified efficiency while the installed assembly still has leakage around the frame.

This is why buyers should distinguish between filter media certification and installed filter integrity testing.

Ask whether the manufacturer can provide the relevant test documentation for the complete filtration assembly.

5. How to Evaluate Air Shower Capacity and Throughput

Manufacturers sometimes advertise the number of people an air shower can process per hour.

However, throughput is not determined by shower cycle time alone.

It depends on several operating factors:

Number of people entering each cycle.Shower duration.

Entry and exit time.

Door opening and closing sequence.

Personnel movement.

Gowning room procedures.

5.1 Calculate Theoretical Throughput

A simplified calculation is:

Theoretical throughput = 3,600 ÷ Total cycle time per person

For example, assume:

Shower cycle: 20 seconds.

Entry time: 2 seconds.

Exit time: 2 seconds.

Additional operational allowance: 5 seconds.

Total time:

20 + 2 + 2 + 5 = 29 seconds.

The theoretical throughput is:

3,600 ÷ 29 ≈ 124 people per hour.

This is a mathematical estimate, not a guaranteed operating capacity.

Actual throughput may be lower because of personnel movement, gowning procedures, hand washing, door operation, and other facility-specific factors.

5.2 Questions to Ask About Capacity

Before accepting a manufacturer's capacity claim, ask:

Is the stated capacity based on one person or multiple occupants?

What shower cycle time is used?

Are entry and exit times included?

Does the calculation include door opening and closing?

Is the stated capacity theoretical or based on actual operating conditions?

The most important consideration is whether the proposed equipment can support the expected personnel flow without creating congestion at the cleanroom entrance.

6. Certifications and Documents to Verify

Certificates and technical documents are important parts of supplier evaluation. However, buyers should understand what each document actually demonstrates.

6.1 ISO 9001

ISO 9001 relates to quality management systems.

It can help demonstrate that a manufacturer operates a structured quality management system.

However, it does not independently certify the performance of a specific air shower.

Check the certificate holder, validity, certification scope, and issuing certification body.

6.2 CE Marking

For equipment supplied to the European market, CE marking indicates the manufacturer's declaration that the product complies with applicable EU legislation.

Depending on the equipment design and applicable legislation, relevant requirements may include electrical safety, electromagnetic compatibility, and machinery safety.

Ask for the EU Declaration of Conformity and supporting technical documentation where applicable.

A CE logo on a product photograph is not sufficient evidence by itself.

6.3 HEPA Filter Test Reports

For H13 and H14 HEPA filters, EN 1822 is a relevant European filter classification and testing standard.

Request documentation identifying:

Filter classification.

Applicable test standard.

Efficiency at the most penetrating particle size (MPPS).

Filter identification and traceability.

Individual integrity test results, where applicable.

Do not confuse a filter manufacturer's batch certificate with an individual filter or installed assembly test report.

6.4 IQ/OQ Documentation

For pharmaceutical and other regulated manufacturing environments, equipment qualification documentation may be required.

IQ (Installation Qualification) and OQ (Operational Qualification) documents support verification of equipment installation and operation.

Ask whether the manufacturer can provide:

Equipment specifications.

Installation requirements.

Wiring diagrams.

Operating instructions.

Factory inspection records.

IQ/OQ documentation templates, where available.

The qualification requirements should be agreed upon before ordering.

Equipment qualification is separate from the validation of the overall cleanroom.

7. Eight Things to Check When Evaluating an Air Shower Factory

A factory visit or live video inspection can reveal details that are difficult to identify from a quotation.

The following eight points provide a practical inspection checklist.

7.1 Nozzle Manufacturing

Inspect the nozzle shape, finish, dimensions, and manufacturing consistency.

Ask whether the nozzle geometry is standardized across production models.

7.2 Plenum Assembly

Request photographs or video of the internal air distribution system before the fan and panels are fully assembled.

Check the arrangement of the plenum and any flow-distribution components.

7.3 HEPA Filter Testing

Ask to see the filter inspection or leak-testing process.

Confirm which tests are performed by the factory and which are provided by the filter supplier.

7.4 Electrical Control System

Inspect the controller, electrical components, wiring arrangement, and interlock sequence.

Ask the manufacturer to demonstrate normal operation and the defined failure response.

7.5 Welding and Surface Finishing

Check internal corners, welded joints, door frames, and panel connections.

The quality of internal finishing is particularly relevant to equipment used in hygiene-sensitive environments.

7.6 Finished Equipment Operation

Ask to see a completed air shower operating under normal conditions.

Observe door movement, controller operation, noise, and airflow operation.

7.7 Spare Parts Availability

Check whether the manufacturer can supply replacement components, including:

Nozzles.

Door seals.

HEPA filters.

Pre-filters.

Controllers.

Electrical components.

Fan and motor assemblies.

Request a spare parts list with model references and indicative prices.

7.8 Export Packaging

Ask to see the packaging method used for recently shipped equipment.

Check protection for stainless steel surfaces, doors, control panels, filters, and other vulnerable components.

Confirm the packing dimensions and shipping weight before arranging transportation.

8. How to Compare Air Shower Manufacturers: A Practical Evaluation Framework

After collecting quotations and technical documents, buyers can use a weighted evaluation framework to compare suppliers.

The following is a suggested purchasing framework. The weighting can be adjusted according to project requirements.

Evaluation Category

Suggested Weight

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