US What an ISO 7 cleanroom is
An ISO 7 cleanroom is a room whose air contains no more than 352,000 particles of 0.5 µm or larger in each cubic meter, as set by ISO 14644-1. It also allows no more than 83,200 particles of 1 µm and 2,930 of 5 µm or larger. Normal room air in an office holds millions of particles per cubic meter at 0.5 µm, so an ISO 7 room is very much cleaner than an ordinary workspace.
ISO 7 sits in the middle of the classes used in manufacturing: ten times cleaner than ISO 8 and ten times less strict than ISO 6. It is the most common class for assembly work where particles matter but the product is not handled as an open sterile process. Under the old US Federal Standard 209E, withdrawn in 2001, it was Class 10,000, a name still heard on factory floors.
The class only defines the particle limit. How a room reaches it, through filtration, airflow, pressure, materials and behavior, is up to the designer and operator. Our overview of cleanroom classes shows where ISO 7 sits across the full ISO 1 to ISO 9 range.
ISO 7 cleanroom requirements
ISO 14644-1 sets the limit and how it is measured. ISO 14644-2 covers monitoring, and the rest of the series covers design, testing and operation. Most ISO 7 rooms are built to similar practical requirements, summarised below. Air change rates and pressure differences are typical design figures, not limits from the standard.
| Requirement | Typical ISO 7 practice | Why it matters |
|---|---|---|
| Particle limit | 352,000 per m³ at ≥ 0.5 µm | The class itself, set by ISO 14644-1 |
| Filtration | HEPA filters in the ceiling or air handler | Removes particles from supply air |
| Air changes | Typically around 30 to 60 per hour | Dilutes and removes particles made in the room |
| Pressure | Around 10 to 15 Pa above adjoining areas | Keeps dirtier air from flowing in |
| Gowning | Coverall or coat, hair cover, overshoes, gloves | People are the main particle source |
| Classification | Particle counts at set locations, at least yearly | ISO 14644-2 sets the monitoring regime |
Surfaces are smooth, non-shedding and easy to wipe, with coved corners and sealed joints. Materials, tools and equipment pass in through an airlock or pass-through hatch after cleaning, and staff enter through a gowning room, often itself an ISO 8 space.
ISO 7 vs ISO 8 and ISO 5
The neighboring classes are the ones most often compared with ISO 7:
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ISO 8 (Class 100,000). Up to 3,520,000 particles per m³ at 0.5 µm, ten times more than ISO 7. Used for packaging, gowning rooms, general controlled areas and less sensitive assembly.
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ISO 7 (Class 10,000). The usual class for electronics and medical device assembly, pharmacy compounding and the background room around critical zones.
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ISO 5 (Class 100). Up to 3,520 particles per m³ at 0.5 µm, a hundred times cleaner than ISO 7. Used for aseptic filling and semiconductor processes, often inside a unidirectional airflow cabinet within an ISO 7 room.
ISO 7 and EU GMP grades
Sterile medicines in Europe are made under EU GMP Annex 1, which uses Grades A to D alongside the ISO classes. ISO 7 appears in two of them. Grade C must meet ISO 7 at rest, when the room is running but empty of people, and ISO 8 in operation. Grade B, the background to Grade A aseptic work, must meet ISO 5 at rest and ISO 7 in operation. GMP also sets microbial limits that ISO 14644-1 does not cover, so a room that meets ISO 7 by particle count is not automatically a GMP Grade C room.
Where ISO 7 cleanrooms are used
ISO 7 rooms are used for electronics and PCB assembly, optics and laser assembly, medical device manufacturing and packaging, hospital and pharmacy compounding, and as the background room around ISO 5 zones in pharmaceutical production. Air is HEPA filtered and the room is held at a positive pressure over its surroundings, except where hazardous materials call for negative pressure.
Computers in an ISO 7 cleanroom
Equipment in an ISO 7 room should add no particles and survive frequent disinfection. That usually means a fanless panel PC or display with no vents, a front sealed to at least IP65 and surfaces that can be wiped with alcohol or other disinfectants. Stainless steel or smooth powder-coated housings, flush touchscreens and sealed connectors all help.
Our guide to clean room computers covers the features to specify in more detail. Our stainless steel panel PCs and fully sealed IP65 panel PCs suit cleanroom operator stations, with the flat fronts and fanless cooling that cleaning procedures expect.
Quick answers on ISO 7 cleanrooms
ISO 7 cleanrooms: common questions
What class is an ISO 7 cleanroom?
Class 10,000. Under the withdrawn US Federal Standard 209E, ISO 7 was Class 10,000, meaning no more than 10,000 particles of 0.5 µm or larger per cubic foot. The name is still used informally.
How many air changes does an ISO 7 cleanroom need?
Typically around 30 to 60 an hour. ISO 14644 does not set an air change rate. Designers choose one that keeps particle counts within the limit for the room’s size, occupancy and processes.
What is the difference between ISO 7 and ISO 8?
Ten times the particles. ISO 8 allows up to 3,520,000 particles of 0.5 µm per m³ against 352,000 for ISO 7. ISO 8 is common for gowning rooms and packaging.
What do you wear in an ISO 7 cleanroom?
A cleanroom coat or coverall, hair cover, overshoes and gloves. Many sites add face masks and beard covers. The exact gowning follows the site’s own procedure and risk assessment.
How often is an ISO 7 cleanroom tested?
At least once a year for classification. ISO 14644-2 sets the monitoring plan, and many sites count particles far more often. GMP rooms also have continuous or frequent environmental monitoring.
We supply fanless, sealed panel PCs and displays for cleanroom work with the finish and mounting matched to your cleaning regime, and integrate and test each system before it ships. Tell us the room class, how it is cleaned and how operators will use the screen, and we will recommend the system to suit.