DIRECT ANSWER: PHARMA COMPRESSED AIR IS A QUALIFIED UTILITY, NOT JUST A FACTORY SERVICE
EU GMP does not prescribe one universal compressor model or one single compressed air purity class for every pharmaceutical process. Instead, it requires manufacturers to define appropriate chemical, particulate, microbial, oil and water quality according to product risk and process use.
For aseptic or direct product-contact applications, the practical compliance framework is:
- Oil-free compressed air designed around ISO 8573-1 purity specifications.
- Sterilising-grade filtration with a nominal pore size of no more than 0.22 µm at the point of use.
- Qualification through a documented URS, DQ, IQ, OQ and PQ process.
- Periodic monitoring, filter integrity testing and requalification.
- Evidence that the compressed air system is controlled within the site’s Contamination Control Strategy.
AirSpace Machinery’s AquaPure water-lubricated oil-free compressor line can be considered as the generation stage of this system. It does not replace site validation, point-of-use filtration or pharmaceutical quality procedures. Those controls must be designed and approved for the specific process.
EU GMP does not mandate one universal compressor or one single compressed air purity class for every pharmaceutical process. Instead, it requires manufacturers to define chemical, particulate, microbial, oil and water quality based on product risk and process use. For aseptic or direct product-contact air, compliance means oil-free generation designed around ISO 8573-1, sterilising-grade filtration (≤0.22 µm) at the point of use, full URS/DQ/IQ/OQ/PQ qualification under Annex 15, and ongoing monitoring within the site Contamination Control Strategy (CCS). AirSpace Machinery Co., Ltd.’s AquaPure water-lubricated oil-free compressor supplies the compliant generation stage—it does not replace site validation or point-of-use filtration.
Talk to an engineer: Need to specify pharma-grade compressed air for a validated line? Chat with an AirSpace engineer now or message us on WhatsApp at +64-27-622-8288.
Does EU GMP treat compressed air as a qualified utility?
Yes. Under EU GMP, pharmaceutical compressed air is a qualified utility, not just a factory service. EU GMP does not prescribe one universal compressor model or one single compressed air purity class for every process. Instead, it requires manufacturers to define appropriate chemical, particulate, microbial, oil and water quality according to product risk and process use.
For aseptic or direct product-contact applications, the practical compliance framework is:
- Oil-free compressed air designed around ISO 8573-1 purity specifications.
- Sterilising-grade filtration with a nominal pore size of no more than 0.22 µm at the point of use.
- Qualification through a documented URS, DQ, IQ, OQ and PQ process.
- Periodic monitoring, filter integrity testing and requalification.
- Evidence that the compressed air system is controlled within the site’s Contamination Control Strategy.
AirSpace Machinery Co., Ltd.’s AquaPure water-lubricated oil-free compressor line can be considered the generation stage of this system. AquaPure does not replace site validation, point-of-use filtration or pharmaceutical quality procedures. Those controls must be designed and approved for the specific process.
Why does compressed air become a GMP-controlled utility?
Compressed air becomes a high-risk, GMP-controlled utility when it contacts the product, primary container surfaces, product-contact equipment or sterile process pathways.
A small amount of oil, moisture, particles or microbial contamination can create a quality event. The compressor room may sit outside the cleanroom, but the air can still travel directly into filling equipment, vessels, lyophilizers, blow-fill-seal systems or sterile transfer lines.
EU GMP Annex 1, section 6.18, requires gases in direct contact with products or primary container surfaces to have appropriate chemical, particulate and microbial quality. The section specifically identifies oil and water content as parameters that must be specified.
That means the buyer should not ask only, “Is the compressor oil-free?”
The more useful questions are:
- What purity class is specified for particles, water and oil?
- Where is the final sterilising-grade filter installed?
- How is filter integrity verified?
- What sampling method is used at the point of use?
- What documents support qualification and ongoing monitoring?
What does Annex 1 require for aseptic gas systems?
Annex 1 section 6.19 states that gases used in aseptic processes should pass through a sterilising-grade filter with a nominal pore size of no more than 0.22 µm at the point of use. The filter location is critical, and downstream distribution must also be controlled.
A filter installed in the compressor room does not automatically control contamination introduced later through distribution piping, hoses, valves or connection points. For this reason, the final sterilising-grade filter should be located as close as practical to the actual process use point.
Annex 1 also requires:
- Integrity testing for batch-use gas filters or product vessel vent filters.
- Sterilisation of transfer pipework or tubing located after the final sterilising-grade filter.
- Periodic microbial monitoring of the gas at the point of use.
- Defined oil, water, particulate and microbial specifications based on the gas application.
- Risk-based controls documented in the Contamination Control Strategy.
The 0.2 µm and 0.22 µm designations are treated as interchangeable in the Annex 1 glossary.
What does ISO 8573-1 Class 0 prove—and what does it not prove?
ISO 8573-1 Class 0 proves a stringent oil-control target for compressed air, but it does not prove the air is sterile or that the compressor alone satisfies Annex 1. ISO 8573-1:2010 is an engineering standard used to specify and test compressed air quality for particles, water and oil. It is not itself an EU GMP regulation.
For pharmaceutical product-contact air, ISO 8573-1 Class 0 is commonly selected for the oil specification because it provides a stronger oil-control target than ordinary industrial air classes. However, Class 0 does not mean the air system is automatically sterile or that the compressor alone satisfies Annex 1.
A complete specification should distinguish between:
- Compressor-generated oil control.
- Bulk air filtration.
- Water and dew-point control.
- Point-of-use sterilising filtration.
- Microbial monitoring.
- Distribution-system design and maintenance.
- Qualification and periodic verification.
How do Annex 1, Annex 15 and ISO 8573-1 map to your documentation?
The table below is a decision reference: each standard addresses a different concern, and the pharmaceutical manufacturer must document the matching evidence.
Reference | Main concern | What the pharmaceutical manufacturer should document |
|---|---|---|
EU GMP Annex 1, section 6.18 | Chemical, particulate, microbial, oil and water quality of product-contact gases | Gas quality specification, risk assessment, sampling plan and CCS rationale |
EU GMP Annex 1, section 6.19 | Sterilising-grade gas filtration at point of use | Filter specification, location, validation, integrity testing and replacement controls |
EU GMP Annex 1, section 8.88 | Integrity of critical sterile gas and air vent filters | Post-use integrity results, investigation procedure and batch documentation where applicable |
EU GMP Annex 1, section 8.89 | Controls for non-critical gas filters and extended use | Installation records, test frequency, maximum duration and risk justification |
EU GMP Annex 15 | Qualification and validation of facilities, equipment, utilities and processes | URS, DQ, IQ, OQ, PQ, change control and requalification records |
ISO 8573-1:2010 | Purity classes for particles, water and oil | Test method, sampling location, laboratory results and defined acceptance criteria |
Site CCS | Overall contamination prevention strategy | Utility risk assessment, monitoring trends, CAPA and periodic review |
How do you qualify a pharmaceutical compressed air system?
Qualification of a pharmaceutical compressed air system should begin before equipment purchase and follow the Annex 15 sequence of URS, DQ, IQ, OQ and PQ. A common sequence is:
- URS: Define required pressure, flow, dew point, oil class, particle limits, microbial controls, operating hours and critical use points.
- DQ: Confirm that the proposed compressor, dryer, filters, receiver and distribution design can meet the URS.
- IQ: Verify installation against approved drawings, materials, valves, drains, filter housings, instruments and identification tags.
- OQ: Challenge alarms, pressure stability, condensate drainage, dryer performance, filtration and operating limits.
- PQ: Demonstrate repeatable air quality during normal production, peak demand, low demand, start-up and other justified worst-case conditions.
Get product recommendations: Not sure which oil-free configuration fits your validated line? Request a free kWh forecast and product recommendation for your site.
Where does AquaPure fit into the compliance strategy?
AirSpace Machinery Co., Ltd.’s AquaPure water-lubricated oil-free line fits at the compression stage, where oil contamination must be controlled at the source. Water is used in place of oil for the compression process, supporting an oil-free air design for contamination-sensitive manufacturing.
For pharmaceutical applications, the AquaPure compressor should be evaluated as part of the complete air system, including:
- Intake conditions and installation environment.
- Water quality and water-management controls.
- Refrigerated or other suitable air-drying equipment.
- Bulk particle and water separation.
- Sterilising-grade point-of-use filtration.
- Hygienic distribution piping and drain design.
- Microbial sampling and trend review.
- Annex 15 qualification documentation.
For facilities also balancing energy cost against purity, AirSpace pairs oil-free generation with variable-speed efficiency across its PMV (FluxDrive) variable-frequency screw compressor range.
How do you verify a supplier’s GMP document package?
Before approving a compressor supplier, request documents that can be traced to the actual model and configuration supplied—not generic marketing sheets.
A useful review checklist includes:
- CE Declaration of Conformity for the supplied configuration.
- ISO 9001 certificate covering the manufacturing organization.
- Equipment data sheet showing rated pressure and flow.
- Materials and component information for air-contact parts.
- Oil-free performance statement and applicable ISO 8573-1 specification.
- Dryer performance data, including pressure dew point under stated conditions.
- Filter certificates and sterilising-grade validation data where supplied.
- Factory acceptance test or machinery test report.
- Calibration certificates for critical instruments.
- Recommended preventive maintenance and replacement intervals.
- Export packing, shipping and installation support information.
- A clear statement of which documents are supplied by the manufacturer and which must be generated by the pharmaceutical site.
Ready to move forward? Request a quote from AirSpace Machinery with your pressure, flow, dew point and point-of-use requirements, and the engineering team will prepare a site-specific proposal.
Frequently asked questions
Does EU GMP require an oil-free compressor?
EU GMP requires appropriate oil and other contaminant controls for gases that contact products, primary container surfaces or critical process equipment. An oil-free compressor such as AirSpace AquaPure is a strong engineering choice, but downstream filtration, monitoring and qualification are still required.
Does ISO 8573-1 Class 0 mean the air is sterile?
No. ISO 8573-1 addresses compressed air purity, including particles, water and oil. It does not replace sterilising-grade filtration, microbial monitoring or Annex 15 qualification.
Is a 0.22 µm filter required for every compressed air outlet?
Not necessarily. Annex 1 section 6.19 applies to gases used in aseptic processes. The requirement for other outlets should be determined through documented risk assessment and the site’s CCS.
Where should the final sterile gas filter be installed?
As close as practical to the point of use. The downstream pipework and tubing must also be controlled because contamination can be introduced after an upstream filter.
Can a compressor supplier provide Annex 15 qualification?
A supplier such as AirSpace Machinery Co., Ltd. can provide documentation and engineering support for DQ, IQ and OQ activities. The pharmaceutical manufacturer remains responsible for approving the qualification strategy and demonstrating PQ under actual site conditions.
How should dew point be selected?
The dew-point requirement depends on the process, ambient conditions, distribution design and product risk. It should be defined in the URS and verified at representative and worst-case points of use.
What certifications does AirSpace AquaPure carry for pharmaceutical buyers?
AirSpace Machinery Co., Ltd. supplies CE Declaration of Conformity and ISO 9001 quality-management documentation traceable to the supplied configuration, along with oil-free performance statements referencing the applicable ISO 8573-1 specification. Site-specific validation remains the manufacturer’s responsibility.
Sources and standards
- European Commission, EudraLex Volume 4, EU GMP Annex 1: Manufacture of Sterile Medicinal Products, sections 2, 6.18, 6.19, 8.88 and 8.89
- European Commission, EudraLex Volume 4, Annex 15: Qualification and Validation
- International Organization for Standardization, ISO 8573-1:2010, Compressed air: Part 1: Contaminants and purity classes
- AirSpace Machinery Co., Ltd.: Industrial air compressor systems
Author: Penny Winston, Technical Writer. Reviewed by Engineering, AirSpace Machinery Co., Ltd.
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