Clean Room Computers: What to Specify for Cleanroom Manufacturing

A clean room computer is an industrial PC or panel PC built so that it adds no particles to a controlled environment and survives the disinfectants used to keep it clean. In practice that means a fanless, sealed enclosure with no vents, smooth wipeable surfaces, a flush touch screen that works with cleanroom gloves and connectors that seal, so the computer can sit inside an ISO 5 to ISO 8 room without compromising it.

Cleanrooms run more software every year: electronic batch records in pharmaceutical suites, MES terminals in medical device assembly, tool interfaces in semiconductor fabs and vision inspection on electronics lines. Each of those screens is a potential source of particles and a surface that has to be disinfected every shift, so the computer has to be chosen with the room in mind, not added afterwards.

This guide covers what a clean room is, the ISO 14644-1 classes and EU GMP grades, what makes a computer cleanroom-compatible, why fans are a problem, how cleanroom computers are cleaned, the options for mounting them inside or through the wall, and how the specification changes between pharmaceutical, semiconductor and medical device production.

A clean room, or cleanroom, is a room in which the concentration of airborne particles is controlled to a specified limit. Air is supplied through HEPA or ULPA filters, rooms are held at a positive pressure over their surroundings, and people enter through gowning areas because they are the largest source of particles in the room.

Cleanrooms are used wherever a particle or a microbe can ruin the product: sterile and aseptic pharmaceutical manufacturing, semiconductor and electronics assembly, medical device production, biotechnology and precision optics. That makes them different from the wet food-processing areas covered in our guide to hygienic design for washdown computers, although some pharmaceutical and food facilities need both.

Cleanrooms are classified under ISO 14644-1:2015 by the maximum number of airborne particles per cubic meter at specified particle sizes. The cleanroom classes FAQ explains the scale in full; the table shows the limits at three sizes, with the former US Federal Standard 209E classes that are still widely quoted.

Each step down the scale allows roughly ten times as many particles. In ISO 7 and ISO 8 rooms, a sealed, fanless panel PC with a wipeable front is usually accepted inside the room. In ISO 5 zones, equipment is kept to a minimum, so the screen is often mounted flush in the wall or behind a window with the electronics in the service corridor. The site’s contamination control strategy has the final say, so bring the cleanroom class and the cleaning procedure to the specification from the start.

Sterile medicines manufactured for the European market follow EU GMP Annex 1, revised in 2022, which uses four grades. Each grade has particle limits at rest and in operation, so the same room can sit in a different ISO class depending on whether production is running.

Annex 1 also asks every site to have a contamination control strategy that covers equipment, materials and cleaning. Anything brought into a Grade A to C room, including a computer, has to be justified, cleanable and compatible with the disinfection program. The US FDA’s aseptic processing guidance takes a similar approach with its own classifications.

An ISO 5 cleanroom allows no more than 3,520 particles of 0.5 µm or larger per cubic meter of air, the level once called Class 100. It is the class of the critical zones in aseptic pharmaceutical filling, where it corresponds to EU GMP Grade A, and of many semiconductor process areas. ISO 5 usually needs unidirectional, or laminar, airflow across the work zone, with filtered air sweeping particles away from the product.

For computers, ISO 5 is where the rules tighten most. Anything that disturbs the airflow or adds particles is kept out, so screens are commonly mounted flush in the wall, set behind a window or built into the isolator, and operated through gloves. Where a panel PC does sit in the zone, it must be fanless, sealed and placed so it does not block the airflow over the product.

ISO 7 allows up to 352,000 particles of 0.5 µm or larger per cubic meter, and ISO 8 ten times that, 3,520,000. ISO 7 rooms typically need more air changes, tighter gowning and more frequent cleaning than ISO 8. Medical device assembly and pharmacy compounding commonly run in ISO 7; packaging, gowning rooms and support areas in ISO 8.

For computers the difference is mostly in the cleaning regime. Both classes accept sealed, fanless panel PCs inside the room, but ISO 7 areas are usually disinfected more often and with stronger agents, so the housing and seals need to be checked against that chemistry.

A standard industrial panel PC is built to survive a factory, not to protect a controlled room. Cooling vents and fans move air through the chassis, textured plastic and painted surfaces trap particles and can shed them as they wear, and open USB and LAN ports, a separate keyboard and a mouse all add surfaces that are hard to clean. Every one of those details either generates particles or gives them somewhere to collect.

Cleaning is the second problem. Cleanroom disinfectants are applied every shift, often by wiping and sometimes by fogging, and they soften plastics, craze polycarbonate and attack unsuitable seals. A clean room computer is designed the other way round: the enclosure is sealed and smooth first, and the electronics are fitted to suit it.

Fans are not banned, but they are avoided in computers inside the room. A fan draws room air through the chassis and exhausts it again, which disturbs the controlled airflow, carries particles from inside the case into the room and stirs up particles that have settled. The dust that builds up inside a fan-cooled computer is released each time the fan speeds up. HEPA fan filter modules are part of the room itself; a computer fan is not filtered in the same way.

That is why fanless design is the default for clean room computers. Heat leaves through the housing or a heatsink, so there are no vents, filters or moving parts to wear. The advantages of fanless computers go beyond cleanrooms, and our guide to active vs passive cooling explains the trade-offs. Where a workload needs more power than a fanless panel PC can cool, the usual answer is to put the computer outside the room and bring only a sealed display inside.

These are the features we work through before recommending a computer for a cleanroom, and the reason each one matters.

ISO 14644-14 provides a method for assessing whether equipment is suitable for use in a cleanroom of a given class by measuring the particles it emits while running. Some equipment makers test to it or to similar schemes; where a site’s quality team asks for this evidence, raise it early, because it is held for specific models.

Cleanroom computers are cleaned with the rest of the room, to the site’s written procedure: usually a wipe with a low-lint wipe and an approved disinfectant, working from the cleanest surface to the dirtiest, with a sporicide on a rotation. Some rooms are also decontaminated with vaporised hydrogen peroxide. The computer has to tolerate every agent in the rotation, every day, for years.

The site’s cleaning validation will often ask for the equipment maker’s chemical compatibility statement. We ask the manufacturer for it at the quotation stage. Antimicrobial coatings are sometimes offered on touch glass; they do not replace disinfection, and their use should be agreed with the site’s quality team.

There is more than one way to put a computer into a cleanroom. The right choice depends on the class, the cleaning and how much of the system can sit outside the room.

For ISO 7 and ISO 8 rooms, a sealed stainless panel PC is usually the simplest answer. For ISO 5, the flush-mount or display-only routes keep heat, cables and moving parts out of the critical zone. Our front IP65 panel PCs are the starting point for through-wall installations.

The cleanroom class tells you how clean the air must be. The industry tells you what else matters, from ESD to data integrity.

In pharmaceutical suites, where EU GMP Annex 1 and the site’s contamination control strategy govern everything that enters the room, see our medical and pharmaceutical solutions. In electronics cleanrooms, ask for the housing to be bonded to the site earth to support ESD control. For the wider production line, see our factory automation solutions.

Environment. Start with the cleanroom class, the disinfectants and whether the room is ever washed or fogged. That sets the sealing, the housing material and where the computer can be mounted.

Performance. Match the processor and screen size to the software, from a simple batch-record terminal to an MES client or a vision inspection station.

Expansion. List every device the computer must connect to and keep each connection sealed, through M12 connectors, PoE or wireless.

Lifecycle. Validated processes make changes expensive. Choose a model with long availability and a controlled bill of materials so a replacement matches the one you qualified.

Browse our IP69K panel PCs for rooms that are sprayed, or our PCAP touch panel PCs for gloved operation.

The systems below are fanless and sealed in their manufacturers’ specifications. As your system integrator we configure and test every system before it ships, imaging the panel PCs with your operating system and software; monitors are configured and tested. Cleanroom suitability is decided by your site, so we provide the manufacturer’s materials and sealing details for your assessment.