La construcción de un cuarto limpio inicia con una evaluación integral de las necesidades del cliente, un paso clave para diseñar un sistema que garantice cumplimiento, seguridad y eficiencia a largo plazo.

1. Planning and Design Phase

The first stage in building a cleanroom is the requirements definition. Ideally, the client provides a list of needs, such as desired ISO classification, room size, temperature and humidity parameters, and operational workflows.
This information allows engineers to prepare an accurate design proposal and budget.

Selecting the right cleanroom type depends on several factors, including personnel, process sensitivity, layout, and contamination control needs.

2. Factors to Consider in Cleanroom Design

Every element inside a cleanroom contributes to maintaining cleanliness and process stability.
The following components are essential for compliance with ISO 14644 standards and Good Manufacturing Practices (GMP):

Personnel

The main source of contamination in a cleanroom is personnel. Human skin, clothing, and microorganisms can introduce thousands of particles per minute.
For this reason, only trained and authorized personnel should enter a cleanroom, following strict gowning procedures and using appropriate protective garments.
The greater the number of employees, the higher the contamination risk—so occupancy must be minimized during operation.

Equipment and Materials

All equipment used inside the cleanroom must be made of non-porous, easy-to-clean materials such as stainless steel, polycarbonate, or high-grade plastics.
Designing furniture and instruments with smooth, rounded surfaces helps prevent dust accumulation and microbial growth.

Walls and Panels

Cleanroom walls should be made from modular insulated panels specifically designed for controlled environments.
These panels are seamless, washable, and chemical-resistant, ensuring easy disinfection and preventing microbial contamination.
Joints are sealed with silicone or coving profiles to maintain airtightness.

Flooring

The most common flooring for cleanrooms is epoxy resin, which provides an antistatic, seamless, and easy-to-clean surface.
In large ISO 5 cleanrooms, a raised access floor may be necessary to ensure proper airflow from the ceiling to the return grilles, optimizing laminar flow.

Air Control System (HVAC)

The HVAC system is the heart of a cleanroom.
It controls airflow, temperature, humidity, filtration, and pressure differentials.
An effective HVAC system ensures a constant supply of filtered air through HEPA or ULPA filters, creating the positive or negative pressure required for each application.

Well-engineered HVAC systems are critical for:

- Maintaining air cleanliness according to ISO classification

- Reducing energy consumption

- Providing comfort and stability for personnel

Lighting

Most cleanrooms use LED panels or LED tubes, installed flush with the ceiling to avoid dust buildup.
Lighting levels are calculated based on lumen requirements and ISO class, ensuring optimal visibility without producing excess heat.

Doors

Cleanroom doors must be flush, hygienic, and durable, made from non-porous materials with a smooth, flat surface.
They should feature flush windows without horizontal edges, antistatic finishes, and airlock systems to prevent pressure loss and contamination.
Automatic interlocking doors are recommended for high-containment or critical areas.

Windows

Windows are essential for supervision and safety.
They provide visibility without compromising cleanliness and are made from shatterproof, fire-resistant materials.
Like doors, they must have no horizontal frames to prevent dust accumulation.

Temperature and Humidity Control

Maintaining stable temperature and relative humidity (RH) is crucial to prevent microbial growth and electrostatic discharge (ESD).
Typical cleanroom conditions are 40–50% RH and approximately 22°C (72°F).
Humidity control is achieved through dehumidifiers and precision air conditioning integrated into the HVAC system.

3. Cleanroom Construction Process

Once the design and materials are approved, the construction process includes:

1.- Structural installation – panel walls, doors, and ceiling grid

2.- HVAC and filtration setup – ducts, diffusers, and HEPA filters

3.- Electrical and lighting systems – LED panels, outlets, control systems

4.- Finishing and sealing – epoxy flooring, silicone joints, coving

5.- Testing and commissioning – airflow, pressure, and particle count verification

The construction timeline depends on the cleanroom size and complexity.
A modular ISO 7 cleanroom, for instance, can often be completed within 8 to 12 weeks, including installation, testing, and validation.

4. Maintaining Cleanroom Performance

To keep a cleanroom functioning correctly, air filtration quality is the most important factor.
Cleanrooms depend on a combination of pre-filters and HEPA filters to maintain purity.

- Pre-filters capture larger particles and extend the lifespan of HEPA filters.

- HEPA filters remove 99.99% of particles ≥0.3 microns.

Pre-filters must be replaced regularly to prevent clogging.
Replacement frequency depends on the cleanroom’s location, air quality, and the type of production carried out.
Regular maintenance and calibration of HVAC components ensure that temperature and humidity remain within specification.

5. Cleanroom Validation and Certification

All cleanrooms must undergo annual validation to confirm that they meet the designed ISO classification.
Validation includes testing with calibrated instruments such as:

- Particle counters – to measure airborne particulate levels

- Manometers – to verify differential pressure between rooms

- Airflow meters – to assess air velocity and direction

These tests verify that air cleanliness, pressure, and environmental conditions remain within the required limits for production safety and regulatory compliance.

Validation must be performed by certified technicians using calibrated, NEBB-compliant equipment, ensuring reliability and traceability of results.

Conclusion

Building a cleanroom requires precision engineering, specialized materials, and strict adherence to ISO 14644 standards.
From the early design phase to final validation, every detail—from the HVAC system to door finishes—contributes to achieving a stable, contamination-free environment.

At Star Filters, we combine technical expertise, certified equipment, and NEBB-trained personnel to deliver turnkey cleanroom solutions that guarantee compliance, performance, and durability.
Our cleanrooms are engineered for industries where air quality means product quality.