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Harald Flechl
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Harald Flechl

Freiberuflicher technischer Experte für Reinraumtechnik.

Published articles

Acceptance testing or qualification?

Acceptance testing or qualification?

Buildings for pharmaceutical production and the therein integrated infrastructure systems have in common that they have to be planned, realised and operated individually and according to the specific case. This individual character results in an increased risk of faults, which must be recognised and rectified in a timely manner so that they do not endanger the quality of the produced medicinal products.

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Sliding doors in cleanrooms - "no go" or "best practice"?

Sliding doors in cleanrooms - "no go" or "best practice"?

In cleanrooms, it is necessary to create a clear demarcation to adjacent, less clean areas. Since the beginning of clean room technology, airlocks have established themselves as an effective means of separating rooms.
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3 Systems for Cleanroom Walls

3 Systems for Cleanroom Walls

Over the past several years, wall and ceiling systems have become the established state of the art in finishing technology. The numerous manufacturers of such systems also offer solutions that are suitable for fire zones and large, high rooms – such as warehouse storage rooms.

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Design Qualification for Premises and Air Handling Units

Design Qualification for Premises and Air Handling Units

The design qualification process may vary depending on the project and the client's requirements and may be carried out in two or three design phases.

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Test interval for integrity testing of HEPA filters in a laminar flow above an injection moulding machine

Test interval for integrity testing of HEPA filters in a laminar flow above an injection moulding machine

We operate a laminar flow above an injection moulding machine in a cleanroom, GMP Grade C (ISO 8 in operation, ISO 7/at rest). The laminar flow achieves ISO class 5 within the cleanroom area.

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Cleanrooms: The Path from Concept to Qualified System

Cleanrooms: The Path from Concept to Qualified System

Beginning from the definition of the User Requirements Specification (URS) the planning phase is subdivided into four stages:

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Regulatory and Industrial Standards for the Qualification of Premises and Air Handling Technology

Regulatory and Industrial Standards for the Qualification of Premises and Air Handling Technology

In the pharmaceutical industry, qualification and validation are the prerequisites for GMP compliant production of medicinal products. Qualification relates to the equipment (rooms and premises, plants and equipment and IT systems), while validation relates to the processes (production and packaging, cleaning, IT processes). Qualification and validation verify the suitability of the equipment and processes for the intended purpose.
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Contamination Control – Cleanliness Zone Concepts

Contamination Control – Cleanliness Zone Concepts

According to the new Annex 1, a Contamination Control Strategy (CCS) must be implemented for the entire cleanroom and controlled environment system of the facility.

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Clean up Period and Recovery Time

Clean up Period and Recovery Time

Do you know the difference between “clean up period” and “recovery time”? Both terms are often used to describe the same procedure, but they are completely different from each other. 
Today's feature clearly explains the differences between test methods for determining the clean-up phase (Annex 1) and the recovery time (ISO 14644-3), using real-world examples.

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