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MENUModular aerospace cleanrooms
Modular aerospace cleanrooms provide rapidly deployable, reconfigurable controlled environments tailored for aerospace assembly, electronics, and propulsion testing where particulate control, ESD protection, and strict environmental stability are critical; they combine prefabricated panels, HEPA/ULPA filtration, and integrated HVAC/BMS to meet industry cleanliness and qualification requirements. Core parameters (minimal):
- Cleanliness: ISO 5–8 (typical ISO 7 for assembly)
- HEPA/ULPA: H13–H14 / ULPA as needed
- Air changes: 60–600 ACH (process-dependent)
- Pressure cascade: 5–15 Pa between zones
- Temp range: 18–24°C (±1°C)
- RH: 30–60% (±3–5%)
- Flooring: ESD-safe vinyl/epoxy
- Power: redundant circuits for critical systems
Cleanliness Standards
Modular aerospace cleanroom designs typically target ISO 5–8 depending on the specific task (assembly, inspection, testing). Deiiang™ recommends ISO 7 as a common baseline for avionics assembly to control particles ≥0.5 µm per ISO 14644-1.
ISO 14644-1 (ISO classes 1–9; particle limits per m³ at specified sizes)
Federal Standard 209E (obsolete but still referenced: classes 1–100,000)
EU GMP Annex 1 (sterile medicinal products; airborne contamination and aseptic processing)
IEST (IEST-RP-CC series; recommended practices for cleanrooms and HEPA/ULPA testing)
EN 1822 / ISO 29463 (HEPA/ULPA filter classification and testing)
ISO 14698 (biocontamination control — monitoring and guidelines)
USP <797>/<800> (compounding sterile/non-sterile hazardous drugs — cleanliness and handling)
ASHRAE (HVAC guidance applicable to cleanroom environmental control)
Air Change Rates
Air changes vary by ISO class and process; for example, ISO 7 often uses 60–90 ACH, while critical ISO 5 spaces may require 300+ ACH with dense FFU arrays. Deiiang™ Product Designer: Deiiang Jason.peng advises sizing HVAC and FFUs to maintain required particle counts and pressure cascade.
ISO 5: 240–600+ ACH (critical environments, high FFU density)
ISO 6: 120–300 ACH
ISO 7: 60–90 ACH (common for aerospace assembly/inspection)
ISO 8: 30–60 ACH (less critical support areas)
Clean zones for sensitive processes (e.g., laminar flow benches): localized 300–1,000 ACH equivalent via FFUs
Transitional/Gowning areas: 10–30 ACH
Temperature & Humidity Control
Typical environmental setpoints: 18–24°C (±1°C) and 30–60% RH (±3–5%), adjusted for specific aerospace processes (composite curing, precision metrology). Specify tight control and logging in the Modular Aerospace Cleanroom BMS.
Building Materials
Use non-shedding, low-outgassing materials: powder-coated steel or aluminum panels, stainless steel (304/316) fittings, ESD vinyl or epoxy flooring, sealed LED lighting, HEPA/ULPA filters. Deiiang™ recommends material certificates and low-VOC finishes for aerospace cleanliness.
Wall/Ceiling Panels: powder-coated steel, anodized aluminum, or composite sandwich panels (polyurethane/mineral wool core)
Doors/Pass-Throughs: stainless steel 304/316 or powder-coated steel with airtight seals and vision panels
Flooring: ESD-safe vinyl, conductive epoxy, or seamless polyurethane
Ceiling Grid & FFUs: aluminum grid with integrated fan filter units (HEPA/ULPA compatible)
Filters: HEPA H13–H14 or ULPA (EN 1822/ISO 29463 compliant)
Ductwork & Plenums: galvanized steel or stainless steel, airtight construction (SMACNA standards)
Sensors & Instrumentation: particle counters, differential pressure transducers, temp/RH probes (calibrated)
Lighting: sealed LED panels (IP65), low-heat, low-VOC housings
Fasteners & Anchors: stainless or zinc-plated corrosion-resistant fixings
Surface Finishes: low-VOC powder coat or electropolished stainless for cleanability
Features & Advantages
Rapid deployment, reconfigurability, lower onsite disruption, predictable validation (IQ/OQ/PQ), and modular scalability. Modular aerospace cleanroom systems also allow integrated ESD control, localized HVAC redundancy, and easier relocation compared with stick-built rooms.
Fast deployment — short lead time (Deiiang™).
Reconfigurable — easy layout changes/relocation.
Factory-quality components — consistent finishes, easier validation.
Integrated ESD & low-outgassing materials — protects avionics.
Scalable HEPA/ULPA filtration with redundancy — high uptime.
Lower onsite contamination risk vs stick-built.
Predictable lifecycle costs & simpler compliance.
Future Trends
Increased use of ULPA filtration, smart BMS with real-time particle analytics, modular cleanroom-as-a-service models, and advanced low-outgassing composite panels for weight-sensitive aerospace applications. Deiiang™ foresees tighter digital integration and AI-driven contamination prediction in future Modular Aerospace Cleanroom projects.
Modular aerospace cleanrooms will adopt AI-driven BMS and real-time particle analytics for predictive contamination control, optimizing HVAC and FFU performance while reducing energy use.
Growth of ULPA filters, low-outgassing composite panels, and modular-as-a-service models will enable faster deployment, easier relocation, and quicker IQ/OQ/PQ through standardized interfaces and digital twins.
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FAQ
What are modular aerospace cleanrooms?
A modular aerospace cleanroom is a type of cleanroom design that allows for quick and flexible assembly and testing of aerospace systems and components. This design utilizes a system of walls and partitions that can be easily disassembled and reassembled. In addition to the architectural features, modular aerospace cleanrooms utilize specialized filtration and HVAC systems to control contamination.
There are a number of applications for modular aerospace cleanrooms including the assembly of avionics and aerospace electronics, the bonding of composite materials, and testing of aerospace propulsion components.
What factors should be considered when determining the appropriate ISO class for an aerospace application?
The determination of the appropriate ISO class is based on the sensitivity of the process being performed. Processes that require the assembly of relatively large components may only require an ISO class 7 cleanroom, while the assembly of aerospace electronics may require an ISO class 5 or 6 cleanroom. The best way to determine the appropriate ISO class for a given process is to consider the worst case scenario and to perform an evaluation of the process to determine the number of airborne particles that may be present.
What air change rates are associated with various ISO classes?
- ISO 5: 240–600+ ACH (critical operations)
- ISO 6: 120–300 ACH
- ISO 7: 60–90 ACH
Air change rates for various ISO classes are based on the type of process being performed. A critical process may require 600 or more air changes per hour, while a less critical process may require 120 to 300 air changes per hour.
Which materials should be used for modular aerospace cleanrooms?
Use powder-coated steel or anodized aluminum sandwich panels, stainless steel 304/316 fittings, conductive epoxy or ESD vinyl flooring, HEPA/ULPA filters, and sealed LED lighting. For other materials, request material certificates to evaluate if they have low outgassing and if they shed/release particles.
Deiiang™ considers corrosion and weight, and recommends the use of composite panels. Corrosion is of special concern in some aerospace applications. In such cases, the tendering agency may request outgassing and VOC (volatile organic compound) test reports.
How long does it take to set up and test a modular aerospace cleanroom?
Expect 6-12 weeks to procure modular components of the cleanroom. The on-site installation may take 2-6 weeks for larger cleanrooms. Commissioning and validation (IQ, OQ and PQ) may take 1-3 weeks. In total, an ISO 7 (100 m2) cleanroom may take 6-10 weeks to complete.
Deiiang™ recommends a 10-15% time contingency for advanced and integrated aerospace systems.
What are the main type of validations performed on aerospace cleanrooms?
IQ is the validation of the installation of cleanroom systems and components. For OQ, perform balancing of air distribution and determine the number of air changes per hour (ACH) in the cleanroom. Assess the functionality of the controls and alarms and ensure they operate as designed. Perform particle count measurements. For PQ, simulate the environment to assess if the cleanroom can achieve the target specifications and required air quality for a given production process. Aerospace cleanrooms are designed for highly specific productions. Their advanced nature, and the required high level of assurance, increases the need for repeatability and traceability of results.
How much does a modular aerospace cleanroom cost?
Modular aerospace cleanrooms are made up of ISO cabins linked together and sealed. The cost of such cleanrooms depends on the ISO class, how big they are, what materials are used, and the Mechanical, Electrical, and Plumbing (MEP) scope of the work. A ballpark estimate would be $200 to $700 per square foot for an ISO 7 modular cleanroom. The cost would be higher for ISO 5 or 6 modular cleanrooms, due to the more stringent requirements for filter fan units (FFU) and ultra low penetrating air filters (ULPA). The total cost for a cleanroom would be the cost of the materials, the MEP work, the installation, and the validation of the cleanroom. A reasonable contingency (an allowed for, but unknown, cost) would be 8-12% of the total cost.
To get an exact cost, customers should request a detailed quote from a few suppliers, and state which functional acceptance tests (FAT) and spare parts would be provided. It would be important to consider the maintenance costs and the lifecycle of the cleanroom, which would be about 3-6% of the total cost of the cleanroom each year.
How to ensure ESD and low-outgassing requirements are met?
To meet ESD requirements, the specification would need ESD carpet or epoxy flooring, wrist straps, or heel straps and ionizers. The acceptance criteria would need to state what resistivity and/or charge decay would need to be.
Outgassing can be managed by requiring materials have a test report that states the materials meet the requirements of ASTM E595 or other similar standards. In addition, materials would need to be of a low VOC. Prior to the installation of the materials, VOC levels would need to be tested.
Can modular cleanrooms be moved or enlarged?
Modular aerospace cleanrooms can be moved. The best systems for relocation use an aluminum frame and are panelized. For ease of disassembly, modular systems employ interfaces, ceiling grids, and FFUs. Plan’s modular units are connected with flexible interfaces. Our systems, which have labeled units, are quick to relocate.
What common problems occur and how are they fixed?
Particle excursions occur because of pressure differentials or from failing filters. Balancing the HVAC (e.g. use of excessive outside air) can also result in unstable pressure and particulate issues. Control of humidity and temperature can also be an issue. FFU balance and ACH are interrelated and play an important role in system performance and stability.
A punch list is kept during the balance and commissioning of the systems. A BMS is logged and connected to the controls of the system. Follow-up audits are performed within the first year to evaluate the stability of the systems.
