Cleanroom Design
Cleanroom Design
A compliant cleanroom design qualification (DQ) is the critical first step in any controlled environment project. At ISO Cleanroom, we translate your operational requirements into coordinated architectural and mechanical blueprints that satisfy international regulatory boards and internal quality standards.
Our design packages provide full working drawings, precise engineering calculations, and comprehensive product specifications. Whether operating in advanced industrial engineering or aseptic pharmaceutical processing, our designs establish a single source of truth for the entire construction and validation lifecycle.
Technical Risk Management
Controlled environment engineering requires the systematic elimination of mechanical, structural, and regulatory risks. Our design methodology directly addresses four primary operational challenges:
- Cost Optimisation: We prevent expensive over-engineering by aligning your HVAC systems and HEPA filtration density precisely with your actual process needs, saving up to 40 per cent on capital costs.
- Pressure Cascade Stability: We design fast-acting air controls and automated interlocking doors (PALs and MALs) to keep pressure differentials stable, preventing cross-contamination when doors are opened.
- Design for Maintainability: We design walk-on ceilings and service corridors so your mechanical plant and filters can be serviced from outside the clean zone, avoiding costly production downtime.
- Eradication of Dirt Traps: We specify continuous, non-porous wall panels with flush vision panels, flush lighting, and radius coving to ensure easy, effective sanitisation.
Engineering for Extreme Environments
Exceptional contamination control requires a design methodology capable of performing in the world's most unforgiving environments. Operating as an ISO 9001 certified organisation and a CHAS accredited Principal Contractor, our engineering team possesses the advanced design and technical skills required to solve complex, non-standard challenges where environmental stability is critical to operational survival.
Working alongside the British Antarctic Survey, we have engineered custom Isohood deployments and clean tent hire solutions where mechanical plant systems must withstand sub-zero external atmospheric pressures and catastrophic thermal drops. Our architectural workflows also encompass high-security subterranean environments for banking institutions and data providers such as ARC Datacentres. These projects require bespoke structural design and layout configuration to manage unique underground airflow restrictions, data integrity risks, and intensive thermal rejection profiles.
Why Partner with ISO Cleanroom?
Our Design-to-Handover Package Includes:
- Full Validation Readiness: Designs that facilitate straightforward Cleanroom Validation (IQ/OQ/PQ).
- Maintenance Integration: Planning for easy access to filters and services to simplify future Cleanroom Maintenance.
- Modularity: Layouts that allow for future Cleanroom Upgrades or expansion.
The User Requirement Specification (URS) Framework
Our team develops your design by evaluating four core areas:
Part 1: Process and Workflow
We map out your planned processes, equipment positioning, and the flow of personnel and products to ensure seamless efficiency and complete contamination control.
Part 2: Specifying the ISO Classification
We define the correct air cleanliness levels based on the ISO 14644-1:2015 standard. To help you identify the appropriate benchmark for your facility, we design to the following industry standards:
| Classification | Typical Applications | Maximum Particles per square metre ($\ge$ 0.5 $\mu m$) |
| ISO Class 5 | Aseptic filling, semiconductor manufacturing, optics/ Optics | 3,520 |
| ISO Class 6 | Biotechnology, medical device packaging, electronics | 35,200 |
| ISO Class 7 | Pharmaceutical background zones, lab testing, cell culture | 352,000 |
| ISO Class 8 | General manufacturing, component assembly, raw material staging | 3,520,000 |
For pharmaceutical and life science environments, we also align our designs directly with EU GMP grades to future-proof your compliance:
- Grade A: Critical zones for high-risk operations, such as aseptic filling.
- Grade B: Background support environments for Grade A zones.
- Grade C & D: Clean areas for less critical stages of manufacture.
Part 3: Environmental Controls
We assess your specific process variables to ensure internal temperature and humidity levels remain perfectly stable. Our engineers calculate internal equipment heat loadings, moisture volumes, and maximum occupancy levels to size a highly energy-efficient HVAC system.
Part 4: Monitoring and Annex 1 Compliance
Once operational, your room will require data to confirm ongoing compliance. We design custom Environmental Monitoring Systems (EMS) that track differential pressure, particulate levels, temperature, and humidity at the exact frequency your process and regulatory standards dictate. Following the recent updates to EU GMP Annex 1, there is a heightened regulatory focus on continuous monitoring systems across the life sciences industry, making data integrity a core component of your facility design.
Spatial Planning and 3D Modelling Options
Using the URS as our blueprint, we evaluate the data to design the mechanical plant, filtration, and airflow systems.
- Spatial Constraints: Most modern cleanrooms require vertical downward airflow. We ensure there is sufficient structural space above the ceiling grid for air filtration plants and ductwork.
- Advanced 3D Clash Detection (Available as an Additional Cost): For complex facilities, we can provide optional 3D modelling software services to create a digital twin of your room. This optional process allows us to spot and resolve space conflicts between large equipment and ductwork long before construction begins on site.
Cleanroom Design Applications
We design bespoke controlled environments tailored to the distinct criteria of your sector:
| Industry Sector | Target Classification | Key Engineering Variables |
| Pharmaceutical & Biotech | Grade A to D (EU GMP) / ISO 5 to 8 | Airlocks (MAL/PAL), biocide-resistant coatings, interlocking doors. |
| Medical Devices | ISO Class 7 to ISO Class 8 | ESD flooring, particulate control, ergonomic packaging layouts. |
| Semiconductors & Optics | ISO Class 1 to ISO Class 5 | Unidirectional laminar airflow, outgassing control, anti-vibration slabs. |
| Aerospace & Defence | ISO Class 7 to ISO Class 8 | Crane integration, oversized access bays, precise humidity controls. |
Turnkey Controlled Environment Capabilities
ISO Cleanroom provides specialist expertise across the entire cleanroom lifecycle, integrating perfectly with our full suite of solutions:
- Cleanroom Construction: Turnkey installation using modular panelling and finishes.
- Cleanroom Validation: Performance testing and verification to strict ISO standards (IQ/OQ/PQ).
- Cleanroom Maintenance: Planned servicing, emergency repairs, and HVAC calibration.
- Cleanroom Upgrades: Modernising and expanding existing classified footprints.
- Cleanroom Rental: Short-term certified solutions for temporary capacity requirements.
Cleanroom Design FAQs
ISO 14644-4 provides a general framework for cleanroom construction based on air cleanliness, whereas EU GMP Annex 1 dictates strict compliance mandates specifically for sterile medicinal products. Annex 1 goes far beyond standard particulate limits by introducing legally binding requirements for continuous microbiological monitoring, segregated airlock pathways, and dynamic pressure gradients.
Internal equipment heat gains dictate the overall cooling capacity required by the cleanroom HVAC system to maintain stable temperature tolerances. Our engineers calculate both the sensible and latent thermal loads of your processing machinery during the initial layout phase to ensure the custom Air Handling Units are correctly sized for peak production.
Yes, an existing building can be retrofitted with a cleanroom provided there is adequate clear ceiling height for the overhead mechanical infrastructure. Our regional design teams conduct structural surveys to verify slab weight capacities, utility distribution, and overhead clearance to integrate modular or panelled cleanrooms within current premises.
A cleanroom Design Qualification provides formal, documented evidence that the proposed facility blueprint fully satisfies all relevant regulatory standards and user requirements before construction begins. This process serves as a compliance gate, ensuring that airflows, filtration densities, and pressure cascades are verified prior to material procurement.
Vertical downward airflow is preferred because it uses gravity to sweep particulates directly out of the critical work zone and into low-level extract grilles. This layout minimizes the risk of "second-pass" contamination, which occurs in horizontal systems when air travels across multiple pieces of equipment or operators sequentially.
Design Engineering Compliance
Every cleanroom facility design is reviewed and approved under the direction of Toni Horsfield, Managing Director at ISO Cleanroom. Our engineering blueprints, architectural configurations, and validation specifications are guaranteed to align fully with current cleanroom testing and certification standards and the latest UK regulatory updates.
