Map exposure before rooms
The process map must show where product, components and primary packaging are open; which contaminants matter; whether operations are aseptic; and how personnel and materials move. Only then can the project assign local protection, background classification and pressure relationships.
A single facility may combine unclassified warehousing, controlled support rooms, ISO 8 preparation, ISO 7 processing and ISO 5 local protection—depending on the product and validated controls.
Classification is more than particle count
ISO 14644 classification addresses airborne particle concentration, but an operating facility also needs a contamination-control strategy covering microorganisms where relevant, temperature, humidity, differential pressure, recovery, cleaning, gowning and monitoring locations. Product standards and GMP expectations may add requirements beyond the room class.
Design setpoints should be linked to process needs and qualification acceptance criteria, not copied from a generic cleanroom schedule.
Engineer flows and HVAC together
Personnel routes, material airlocks, waste exit, pressure cascades and equipment heat loads affect the HVAC concept. Poor zoning creates excessive air change, difficult balancing and cross-flow risks. It can also make future capacity expansion impossible without interrupting operations.
The basis of design should include occupancy, equipment loads, door-opening assumptions, filtration stages, room recovery targets and failure alarms.
Qualify the installed system
DQ confirms that the design answers the user requirement. IQ verifies installation. OQ challenges operating ranges, alarms and recovery. PQ demonstrates performance under routine conditions. Classification at rest is only one part of that evidence chain.
Monitoring and requalification frequencies must be risk-based and embedded in the operating budget.
Investor checklist
- Open-product and contamination risks mapped
- Room class justified by process step
- Personnel, material and waste flows separated
- HVAC setpoints tied to qualification criteria
- Routine monitoring and requalification costed
This briefing is a decision framework, not legal, regulatory or financial advice. Requirements vary by jurisdiction, product and facility scope. Certification and market authorisation remain subject to competent-authority decisions.
Define a cleanroom basis of design
Translate the briefing into a project-specific scope, responsibility map and feasibility workplan.