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Cleanroom Design

Cleanroom Design

We offer Cleanroom Designs to the ISO 14644-4:2022 and EU GMP requirements.

As part of our cleanroom design and build package we provide full working drawings, design calculations, guidelines and product specifications of the materials selected to meet your brief.

Cleanroom design specification

Specifying the classification of your cleanroom

Many industries are required to perform at least one of their processes within a controlled environment. The internationally recognised specification system for these spaces is defined by the ISO (The International Organisation of Standards) and it is the first question that needs answering before any cleanroom design can commence. Your client, government organisation or regulatory board will refer to this ISO 14644-1:2015 standard when detailing the minimum air cleanliness levels they require of your production, storage or assembly space.

There are processes, especially in the research and development arena where the minimum required ISO 14644 classification is not defined and the task of agreeing on the appropriate level can prove more difficult. ISO have compiled the table below to help specifiers select a suitable ISO classification level.

ApplicationClassification (ISO class)
Advanced EngineeringAerospace5 to 7
Composite materials8
General background8
Isolation of Injection Moulded Parts7 to 8
Optical7 to 8
Touch screen assembly7
ConsumablesE-Liquid7 to 8
Food packaging8
Vitamin and protein packaging7 to 8
Solar5 to 7
Wafer fabrication5
Medical DevicesImplantable devises5 to 7
Medical devise packaging7 to 8
Medical devise reprocessing7
ISO classification level.

EU GMP also give helpful examples of operations and grades for aseptic preparation and processing operations in cleanroom grades to help with specification.

EU GGMP gradeApplication
Grade AAseptic assembly of filling equipment
Connections made under aseptic conditions (where sterilized product contact surfaces are exposed) that are post the final sterilizing filter. These connections should be sterilized by steam-in-place whenever feasible.
Aseptic compounding and mixing
Replenishment of sterile bulk product, containers and closures
Removal and cooling of unprotected (e.g. with no packaging) items from sterilizers
Staging and conveying of sterile primary packaging components
Aseptic filling, sealing of containers such as ampoules, vial closure, transfer of open or partially stoppered vials
Loading of a lyophilizer
Grade BBackground support for the Grade A zone (when not in an isolator)
Transport, while protected from the surrounding environment, of equipment, components and ancillary items for introduction into the Grade A zone
Grade CPreparation of solutions to be filtered including weighing
Grade DCleaning of equipment
Handling of components, equipment and accessories after washing
Assembly of cleaned components, equipment and accessories prior to sterilization
Assembly of closed and sterilized SUS using intrinsic aseptic connectors
EU GMP guide

Specifying the size of your cleanroom

One of the main problems we see in cleanrooms is over population. All cleanrooms rely on air flow to keep the particulate levels within your specified classification. All objects within the cleanroom have an effect on this air flow and so it is important to have a cleanroom design that takes the equipment you will be using into consideration.

Selecting the position of your cleanroom

When selecting the position of the cleanroom a critical dimension to consider is the ceiling height. There are examples of where a cross flow or horizontal flow of air in more beneficial to a process but for the vast majority of cleanroom applications vertical airflow is the preference. This requires a certain amount of air filtration plant and/ or duct work to be positioned above the cleanroom ceiling height.

Temperature and humidity control to the cleanroom

Some applications require additional controls within the cleanroom. These can include static or ESD control, light and very commonly temperature and or humidity control. These requirements must form part of the initial cleanroom design brief.

When specifying temperature control the more information you can provide the more efficient the system will be both in terms of purchase cost and running costs. It may seem like a lot of questions initially but to get an accurate quote the information you will need at the start of the cleanroom design is as follows;

  • the electrical loadings of every item that will be within the cleanroom
  • the maximum number of people required in the cleanroom
  • where the air handling plant can be positioned, inside or outside
  • the temperature of the make up air. Will it be taken from inside or outside
  • geographical location

Monitoring the cleanroom

With the update to Annex 1 more focus has been placed on monitoring. There are many ways to monitor a cleanroom dependant upon the class of the cleanroom, the required frequency of monitoring and the variables that you would like to monitor. We have great industry partners that can walk you through the design on this element to the cleanroom. Just mention it as part of your brief.

The above information will be enough information to get a quotation for a cleanroom.

Once complete you also have the option to add the new build validation package onto your cleanroom design which allows for testing and reporting at the 3 ISO stages. We also offer emergency cleanroom maintenance and servicing.

Cleanroom design and build specialists

We have designed cleanrooms on trains, in deserts, in the Antarctic and Arctic and underground. We love a challenge!

In order for us to quote for your cleanroom design we will need to know a little information to form your brief

Fill out the form on this page, or view our contact page for more methods of getting in touch with us

Get in touch

Peter Phillips

I knew of Toni and her team from around 2003 and the days of their Clean Tent business. With a small new business that needed a clean room, I went straight back. Very helpful discussion with Toni led me to choosing a custom lamina flow hood (cheaper!) which was delivered bang on time, immediately passed an ISO 1385 audit and has been cheerfully maintained ever since. I'd go back to ISOClean because they know their stuff and do what they say.


ISO Cleanroom were very easy and practical to work with. Both Toni and Amaleed were knowledgeable and very flexible - looking forward to working with them in for future projects.

Siobhan Carey

I recently contracted Iso Cleanroom to design and build two modular ISO Class 6 cleanrooms so that our small orthobiologics company could implement in-house manufacture. They delivered on all of their commitments on cost, schedule and quality with no fuss. They showed up they day they said the would and finished up the day they said they would. They were extremely organised and meticulous, and helped us to address some unforeseen issues that cropped up during the installation.

Gareth Evans

We contracted ISO Cleanroom to design, build and validate a large cleanroom in our new facility. Toni really knows her business, and was very helpful through the design process, enabling us to make the most of the available space. When it came to installation, Anthony and his team did an exceptional job, keeping the install to schedule. We are very happy with the professional service we have had from ISO Cleanroom and would not hesitate in recommending others to use them for any cleanroom requirements.