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Portable Cleanroom Selection Guide: ISO Class & Setup
A portable cleanroom can add controlled production space without committing to permanent cleanroom construction, but portability does not remove the need for proper airflow design, site preparation, and qualification. The right system should be selected from process contamination risk, required ISO class, equipment footprint, utilities, and relocation frequency. For temporary manufacturing or pilot production, a well-specified modular system can reduce construction work while still providing measurable cleanroom performance.
How to Choose a Portable Cleanroom for Your Application
Define ISO Class from Process and Contamination Risk
Start with the product and process rather than choosing an ISO class from a supplier catalog. ISO 14644-1:2015 remains the current classification standard in 2026 and defines air cleanliness according to airborne particle concentration from 0.1 µm to 5 µm.
Typical applications include ISO 8 for less particle-sensitive assembly, ISO 7 for many medical-device or electronics processes, and ISO 5–6 for critical local processing.
Commercial portable systems demonstrate that mobility does not automatically limit cleanliness: one current 8 × 4 × 8 ft portable enclosure uses four HEPA FFUs to create an ISO 5 processing zone.
Choose Softwall, Hardwall or Hybrid Portable Cleanroom Construction
A portable clean room can use PVC curtains, rigid panels, or a combination of both.
Construction | Best Use | Main Limitation |
Softwall | Temporary production, inspection | Limited pressure/environmental control |
Hardwall | Longer-term controlled manufacturing | Higher cost and relocation effort |
Hybrid | Changing production requirements | More design coordination |
Softwall construction is easier to dismantle or reposition. Hardwall systems provide better enclosure integrity, while a mobile cleanroom mounted on casters can be useful for localized workstations.
In our experience, buyers sometimes pay for rigid construction when the real requirement is only localized particle control. If temperature, humidity, and pressure are not tightly controlled, a simpler softwall system may reduce both capital cost and relocation labor.
Match the Cleanroom to Temporary, Pilot-Line or Expansion Projects
A temporary cleanroom is particularly useful when production may move within 6–24 months, a pilot line has uncertain future capacity, or an existing facility cannot tolerate lengthy construction.
Portability has limits. Large process exhaust, compressed gases, chilled water, or permanent utilities can make relocation almost as complicated as moving a conventional room.
Portable Cleanroom Sizing, Airflow and Site Requirements
Calculate Room Size from Equipment, Operators and Material Flow
Do not size only from machine dimensions.For example, a process occupying 120 ft² may require 180–220 ft² after adding operator positions, carts, maintenance access, and material movement. A 3-ft service clearance around critical equipment can substantially increase the final footprint.For US installations, coordinate doors with applicable building and accessibility requirements. The 2024 IBC generally requires qualifying egress doors to provide at least 32 inches (813 mm) of clear opening width.
Size FFUs and HEPA/ULPA Filtration for the Target ISO Class
A basic airflow calculation is:
Required airflow (CFM) = Room volume × design ACH ÷ 60
A 12 × 16 × 8 ft room contains 1,536 ft³. Using 60 ACH as an initial engineering assumption gives 1,536 CFM.
Do not treat 60 ACH as an ISO requirement. ISO 14644-1 specifies particle concentration limits, not mandatory ACH values.
Current commercial FFUs illustrate available capacity: modular cleanroom FFUs commonly provide roughly 700–800 CFM, depending on fan speed, filter resistance, and manufacturer configuration. Final FFU quantity should be based on actual system performance and qualification results.
Check Ceiling Height, Floor Loading, Power and HVAC Before Installation
Portability does not mean “install anywhere.”
- Available ceiling clearance
- Door and freight-elevator dimensions
- Floor condition and equipment loading
- 120 V, 208/220 V, or project-specific power
- Existing HVAC capacity
- Fire protection and sprinkler interference
One current portable ISO 7 unit measures approximately 106 × 43 × 72 inches, weighs 400 lb, and requires 220 V, 6 A, 720 W.
From the projects we’ve completed, insufficient ceiling clearance and electrical capacity cause more installation delays than cleanroom framing itself. Site surveys should therefore be completed before purchase.
Plan Temperature, Humidity, ESD and Pressure Control When Required
A basic portable enclosure mainly controls particles. If the process requires 21 ±1°C, 45 ±5% RH, ESD protection, or a defined pressure cascade, those values should appear explicitly in the RFQ.
Adding dedicated cooling, dehumidification, return-air systems, or ESD flooring can turn a simple portable clean room into a much more complex HVAC project.
Deployment, Relocation and Qualification Requirements in 2026
What Must Be Tested Before a Portable Cleanroom Enters Production
Before release, verify the parameters defined in the URS. Typical tests include:
- Airborne particle classification.
- HEPA/ULPA filter integrity where specified.
- Airflow volume or velocity.
- Room pressure differential.
- Temperature and humidity.
- Control, alarm, and interlock functions.
ISO 14644-3:2019 provides cleanroom performance test methods for both unidirectional and non-unidirectional systems and recognizes as-built, at-rest, and operational occupancy states.
What Must Be Requalified After Moving the Cleanroom?
A mobile cleanroom should not be assumed compliant simply because it passed testing at its previous location.Relocation can affect filter seals, frame alignment, airflow distribution, power supply, pressure relationships, and surrounding contamination conditions. ISO 14644-2 requires a risk-based monitoring plan to provide evidence of ongoing particle-cleanliness performance.For a simple relocation within the same controlled building, risk assessment may support a focused test scope. After disassembly, transport, filter removal, HVAC modification, or installation in a different environment, particle classification and affected performance tests should normally be repeated before production.
Apply ISO 14644-5:2025 to Personnel, Materials, Cleaning and Operations
ISO 14644-5 was substantially updated in May 2025. The current edition requires an Operations Control Programme (OCP) covering personnel, entry and exit, material transfer, cleaning, maintenance, training, and monitoring.This matters especially for a temporary cleanroom because physical mobility does not reduce operational contamination risk. SOPs should define gowning, cleaning after relocation, material entry, equipment transfer, and monitoring responsibilities.
Build an RFQ Checklist for Comparable Portable Cleanroom Quotations
Ask each supplier to quote the same scope:
- Internal usable dimensions
- ISO classification and occupancy state
- HEPA/ULPA filter grade
- FFU quantity and airflow
- Softwall or hardwall construction
- Temperature/RH requirements
- ESD requirements
- Electrical load and voltage
- Installation and relocation method
- Testing and certification scope
Also identify whether freight, assembly, site electrical work, HVAC modifications, commissioning, and certification are included. Otherwise, two quotations that appear 20–30% apart may actually cover very different scopes.
FAQ
What ISO class can a portable cleanroom achieve?
Portable systems can achieve several ISO classifications depending on construction and filtration. Commercial systems are available for ISO 5, ISO 7, and ISO 8 applications, including portable ISO 5 units using multiple HEPA FFUs.
Does a portable cleanroom need to be recertified after relocation?
The required scope should be risk-based, but moving the enclosure can change airflow and contamination performance. At minimum, evaluate what was disturbed and repeat the affected qualification tests; after major relocation or disassembly, particle classification should normally be reconfirmed before production. ISO 14644-2 and ISO 14644-3 provide the relevant monitoring and test framework.
When should you choose a portable cleanroom instead of a permanent cleanroom?
Choose one for pilot production, temporary capacity, changing factory layouts, localized equipment isolation, or projects where future relocation is likely. A permanent system is generally better when the facility needs extensive process utilities, tightly controlled HVAC, high structural integration, or long-term validated production.
A properly selected portable cleanroom should therefore be treated as engineered cleanroom infrastructure, not simply a movable enclosure. Define ISO class, airflow, process area, utilities, operating controls, relocation method, and requalification scope before purchase so flexibility does not come at the expense of contamination control.
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We'll call you
In order to serve you better, if you could kindly send an e-mail to nick@biogreenness.com for questions and details.
