A pharmaceutical manufacturing facility can have completed walls, installed equipment and operational HVAC systems yet still have unresolved compliance gaps. The problem often begins before construction, when room layouts, contamination-control measures, engineering specifications and regulatory requirements are planned separately.
For pharmaceutical manufacturers in India, preparing a cleanroom design compliance checklist before applying for a manufacturing licence helps identify these gaps early. It provides a structured way to review the facility against its intended manufacturing activities, applicable Good Manufacturing Practices (GMP) and supporting documentation requirements.
This guide explains what to check, which documents to prepare and how to assess design readiness before moving towards licensing and inspection.
Understand the Applicable Regulatory Requirements First
Before preparing drawings or specifying cleanroom equipment, identify the regulatory requirements applicable to the proposed facility.
In India, Schedule M of the Drugs Rules, 1945, is a key reference for pharmaceutical GMP requirements. The revised Schedule M was notified through G.S.R. 922(E), dated 28 December 2023. Its requirements address pharmaceutical quality systems, premises, equipment and manufacturing controls.
However, the applicable requirements depend on the products manufactured, the processes involved and the relevant licensing framework.
Begin by identifying:
- The intended dosage forms, such as tablets, capsules, liquids or sterile injectables.
- Whether the facility handles sterile products, hazardous substances or other products requiring specialised controls.
- The manufacturing activities and processing stages planned at the site.
- Applicable Schedule M provisions and any additional product-specific requirements.
- The relevant State or Central licensing authority and its current application requirements.
For technical guidance, WHO’s pharmaceutical GMP documents provide additional information on HVAC design and sterile manufacturing. These documents should complement, rather than replace, applicable Indian regulatory requirements.
Prepare a Product-Specific Cleanroom Design Checklist
A cleanroom should be designed around the manufacturing process, not around a standard room layout copied from another facility.
For example, a tablet manufacturing facility may need effective dust extraction and controls against product mix-ups. A sterile injectable facility requires a different contamination-control strategy, including controls appropriate to aseptic processing where applicable.
Before approving the design, confirm that:
- Each product and manufacturing process has been identified.
- Product exposure points and contamination risks are documented.
- Required room functions and environmental conditions are defined.
- Equipment dimensions, operating requirements and maintenance access are considered.
- Material and personnel movement have been mapped.
- The proposed design supports planned production capacity and future expansion.
Practical recommendation: Prepare a room data sheet for every production and supporting room. Record its intended use, equipment, environmental requirements, cleaning needs and applicable controls. This creates a direct connection between process requirements and engineering decisions.
Review the Facility Layout and Material Flow
The layout should support logical manufacturing operations while reducing contamination, cross-contamination and product mix-up risks.
Review the movement of raw materials from receipt through storage, sampling, dispensing, processing, packaging and finished-goods storage. Personnel movement, waste removal and equipment movement should also be assessed.
What should the layout checklist include?
- Approved site and floor plans showing room names and intended functions.
- Defined personnel and material entry routes.
- Appropriate gowning rooms, airlocks and material-transfer arrangements where required.
- Separation or suitable control of incompatible activities and materials.
- Adequate space for equipment operation, cleaning and maintenance.
- Identified locations for rejected materials, waste and in-process storage.
- Suitable access for cleaning and inspection of surfaces and equipment.
A useful design review exercise is to trace one raw material through the complete production process. Identify every transfer, temporary storage point and interaction with other materials.
If the route creates unnecessary backtracking, uncontrolled crossing or unclear material status, address these issues before construction fixes the layout in place.
Verify Cleanroom Classification and Contamination Control
One common design mistake is selecting a cleanroom grade before understanding the process and its risks.
Not every pharmaceutical manufacturing room requires the same cleanliness classification. The appropriate requirements should be justified using the product, process, exposure conditions and applicable standards.
The checklist should establish:
- The required classification, where applicable, and its technical justification.
- Critical areas where products are exposed to the environment.
- Measures for controlling airborne particles, dust and other contamination risks.
- Personnel gowning and material-transfer requirements.
- Cleaning, disinfection and environmental monitoring arrangements.
- Segregation and containment measures for products that present specific risks.
For sterile pharmaceutical manufacturing, WHO’s GMP guidance for sterile products provides additional considerations for contamination-control strategy and environmental conditions.
The key is to document why a particular control is required and how the proposed design supports it. A classification label alone does not demonstrate that the facility will consistently maintain suitable conditions.
Check HVAC Design Before Construction
Heating, ventilation and air-conditioning systems influence room pressure, airflow, temperature, humidity and contamination control. Their design must therefore be coordinated with architectural layouts and manufacturing operations.
WHO’s TRS 1010, Annex 8, specifically addresses HVAC systems for non-sterile pharmaceutical products and emphasises considering HVAC requirements during the initial facility design stage.
HVAC compliance checklist
- Room-wise temperature and relative-humidity requirements are defined.
- HVAC zones and air-handling-unit allocations are documented.
- Airflow direction and room-pressure relationships are justified.
- Filtration and air-distribution requirements are specified.
- Dust extraction and exhaust arrangements are assessed.
- Monitoring points and alarm requirements are identified.
- Equipment heat loads and maintenance access are included in the design.
- Air balancing, filter-integrity testing and qualification activities are planned where applicable.
Avoid applying identical air-change rates or pressure differentials to every room without technical justification. The appropriate design values depend on the process, containment objectives, risk assessment and applicable requirements.
HVAC drawings should also be coordinated with ceilings, lighting, ducts, cable trays and production equipment. Late changes to these interfaces can create avoidable construction rework and commissioning delays.
Assess Construction Materials and Supporting Utilities
Cleanroom finishes and utility arrangements affect cleaning, maintenance and the facility’s ability to control contamination.
Review whether floors, walls, ceilings, doors and service penetrations are suitable for their intended environment. Surfaces should support the specified cleaning methods, while joints and openings should not create unnecessary contamination risks.
The checklist should also cover:
- Cleaning access around equipment and fixed installations.
- Suitable arrangements for pipes, ducts and electrical services.
- Utility requirements based on intended manufacturing use.
- Water systems, compressed air and process gases where relevant.
- Drainage provisions justified by the process and hygiene requirements.
- Maintenance access and replacement of critical equipment.
- Backup arrangements for utilities whose failure could affect product quality.
Utility specifications should be determined by intended use rather than copied from another facility. For example, pharmaceutical water requirements depend on how the water will be used in manufacturing.
Plan Qualification and Validation Before Commissioning
Qualification should not be treated as paperwork to complete after the building is finished. Planning it early helps ensure that the design includes the access, instruments and testing provisions needed to demonstrate suitable performance.
The qualification approach should be defined according to the system and process.
| Stage | What it establishes |
|---|---|
| Design Qualification (DQ) | Whether the proposed design meets defined requirements |
| Installation Qualification (IQ) | Whether systems are installed according to approved specifications |
| Operational Qualification (OQ) | Whether systems operate as intended across specified conditions |
| Performance qualification or relevant process qualification | Whether the system or process demonstrates the required performance under defined conditions |
These activities are related but are not interchangeable. Their scope and acceptance criteria should be established before execution.
For cleanroom and HVAC systems, consider whether the plan requires airflow testing, pressure checks, temperature and humidity verification, HEPA filter-integrity testing, particle classification or other performance tests.
Sterile manufacturing may require additional controls and qualification activities. The applicable requirements should be established for the specific facility rather than assumed to be identical across all pharmaceutical operations.
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Organise Documentation for Design Review and Inspection
A compliance checklist is useful only when its findings can be linked to evidence.
Prepare a controlled document register that identifies each requirement, the relevant drawing or specification, its approval status and any outstanding action.
Depending on the facility, relevant documents may include:
- Site plans, floor plans and room data sheets.
- Manufacturing process and personnel/material flow diagrams.
- HVAC drawings and engineering calculations.
- Equipment and utility specifications.
- Contamination-control risk assessments.
- Cleaning and environmental monitoring strategies.
- Qualification and validation plans.
- Applicable procedures, records and document-control arrangements.
- A register of design changes, deviations and unresolved issues.
This is a design-readiness document register, not a universal statutory application list. The actual licence application may require additional forms, fees, premises details, technical staff information and equipment documentation.
Verify the current requirements with the relevant licensing authority before submission.
Conduct a Final Gap Assessment Before Applying
Once the design and documentation have been reviewed, assess every checklist item using a consistent status system.
Ready: The requirement has been addressed and supporting evidence is available.
Gap identified: A drawing, calculation, specification or control requires correction or further review.
Critical unresolved issue: A potential product-quality, contamination-control or regulatory risk remains open.
Not applicable: The requirement does not apply, and the rationale has been documented.
Assign each open item to a responsible person, with a target completion date and evidence required for closure. Prioritise issues that could affect product quality, contamination control or compliance with applicable requirements.
A multidisciplinary review involving engineering, production, quality assurance and regulatory personnel can help identify conflicts that a drawing review alone might miss.
How IMARC Engineering Can Help
IMARC Engineering supports cleanroom and cold-chain design planning for industrial facilities. For pharmaceutical projects, engineering support can help coordinate layouts, HVAC requirements, utilities and design documentation with the intended manufacturing process. Early design review can also help identify potential interface issues before they become expensive construction changes. The appropriate scope depends on the facility, product category and project requirements. Manufacturers should confirm specific service deliverables with IMARC Engineering and independently verify regulatory obligations with the relevant licensing authority before applying for a licence.
Conclusion
A cleanroom design compliance checklist should connect regulatory requirements with actual manufacturing operations. Reviewing the process, layout, contamination controls, HVAC, utilities, qualification strategy and supporting documents before construction is complete helps identify problems while changes are still manageable.
The checklist does not guarantee licence approval, but it provides a practical framework for design review, corrective action and inspection preparation. Manufacturers should verify applicable requirements against current regulations and the expectations of the relevant licensing authority before submitting an application.
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