CALL AN EXPERT! +86-131-3073-8426
Modular Clean Room Guide 2026: Class, HVAC & Layout
A modular clean room can shorten installation and simplify future changes, but only when class, HVAC capacity, and workflow are defined before quotations are compared. This guide helps engineering teams turn process risk into a buildable specification without buying unnecessary controls.
Select the Required Cleanliness Class from Process Risk
Translate Product and Process Risks into an ISO 14644-1 Classification
Start with contamination consequence, not a preferred class. ISO 14644-1 classifies airborne particle concentration, while ISO 14644-3 recognizes as-built, at-rest, and operational states.
Process condition | Starting point | Preliminary airflow |
Closed food, packaging, or lab support | ISO 8 | 10–25 ACH |
Open medical-device assembly | ISO 7–8 | 20–45 ACH |
Exposed sterile product | Grade A/ISO 5 local zone | Unidirectional |
These are budgeting assumptions, not ISO requirements. Final airflow depends on particle generation, heat, occupancy, exhaust, leakage, and recovery time.
In our experience, teams often classify an entire suite as ISO 7 when only one step needs higher protection. An FFU ceiling, RABS, or isolator around that step can reduce conditioned area and energy use.
Distinguish At-Rest, Operational, Local-Zone, and Background Requirements
EU GMP Annex 1 requires classification at rest and in operation and generally uses Grade B as the background for Grade A aseptic work unless isolator provisions justify another approach.
The URS should state the critical zone, background, maximum personnel, equipment mode, recovery target, and monitoring points. Otherwise, suppliers may quote different systems against the same class description.
Engineer the Modular Clean Room HVAC System and Building Envelope
Calculate Airflow, Heat Load, Filtration, Pressure, Temperature, and Humidity
A modular cleanroom HVAC calculation should include people, equipment, fan-filter heat, outdoor air, humidity, leakage, and exhaust replacement. For a 100 m² room with a 2.7 m ceiling, 40 ACH equals about 10,800 m³/h before exhaust and pressure losses.
For sterile areas, Annex 1 gives a 10 Pa guidance value between adjacent grades and 0.36–0.54 m/s at the working position for unidirectional airflow. It also calls for airflow visualization at rest and in operation.
From the projects we’ve completed, HVAC commonly represents 35–55% of installed clean room construction cost. Non-sterile ISO 7–8 modular cleanrooms often budget at US$250–$600 per ft²; sterile suites with redundancy and validation can exceed US$800 per ft².
Specify Wall Panels, Ceilings, Floors, Doors, Windows, and Service Penetrations
Specify panel thickness, core, fire performance, finish, ceiling load, coving, and chemical resistance. Common systems use 50–100 mm painted-steel, stainless-steel, or HPL-faced panels.
Every cable, pipe, window, door, and duct penetration creates leakage and cleaning risk. Clean room construction drawings should show flush details, sealants, interlocks, and maintenance access.
For U.S. sites, coordinate locally adopted IBC, IMC, IFC, and electrical and fire requirements. The IBC governs occupancy, egress, construction type, fire protection, and interior finishes—not cleanliness classification.
Plan Installation, Qualification, and Future Expansion
Coordinate Modules, Equipment, Utilities, BIM Models, and Expansion Interfaces
Freeze equipment footprints, utilities, return-air paths, maintenance clearances, and personnel and material flows before fabrication. Late changes still cause remade panels and revised controls.
Reserve blank panel bays, capped utilities, spare electrical capacity, BMS points, and AHU or FFU capacity. Modular cleanrooms reduce demolition, but expansion beside production still needs containment, balancing, testing, and change control.
Define FAT, SAT, IQ, OQ, Certification, and Ongoing Monitoring Deliverables
Put these deliverables in the contract:
- FAT and SAT against the approved URS.
- IQ/OQ protocols, drawings, certificates, and calibration records.
- HEPA integrity, airflow, pressure, temperature/RH, recovery, particle, and smoke tests.
- Monitoring points, alert limits, training, and requalification duties.
EU GMP Annex 15 links qualification to the URS and identifies DQ, FAT/SAT, IQ, and OQ as lifecycle stages. ISO 14644-2 requires a monitoring plan based on parameters affecting particle control.
In our experience, regulated projects should reserve roughly 5–10% of the budget for commissioning, qualification, certification, and documentation. Modular interfaces also add joints and supplier dependencies; poor detailing can cause leakage or difficult maintenance.
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 about your theoretical and special architectural plans, projects, and product specifications, your request will be responded to as soon as possible.
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.
