Introduction
Preparing a sophisticated space telescope for launch requires an ultra-clean environment to protect sensitive optics and instruments from contaminants. In late April, NASA took a major step forward at Kennedy Space Center’s Payload Hazardous Servicing Facility (PHSF) by receiving critical support equipment: eight high-efficiency particulate air (HEPA) wall modules, each weighing 1,800 pounds. This equipment is essential for upgrading the cleanroom systems that will house the Nancy Grace Roman Space Telescope during final pre-launch operations. This guide walks through the process of integrating such upgrades, from receiving the modules to readying the telescope for its journey aboard a SpaceX Falcon Heavy rocket.
What You Need
- HEPA wall modules – eight units, each 1,800 lbs, designed to filter airborne particles to stringent levels
- Ground support equipment – cranes, dollies, and handling fixtures for moving heavy modules
- Cleanroom facility – such as NASA’s PHSF with existing HEPA filtration infrastructure
- Trained technicians – experienced in handling cleanroom components and contamination control
- Inspection tools – particle counters, pressure gauges, and leak detection kits
- Safety gear – cleanroom suits, gloves, and breathing apparatus to maintain cleanliness
- Documentation – installation manuals, testing protocols, and compliance checklists
Step-by-Step Process
Step 1: Receive and Offload the HEPA Modules
On arrival day, the modules are transported to the PHSF loading dock. Technicians use a heavy-lift crane to carefully offload each 1,800-pound module from the delivery truck. The modules are then placed on a clean, padded staging area. This step requires coordination between logistics teams and facility staff to ensure no damage occurs during transfer. The offloading at Kennedy took place on April 27, marking the start of integration.
Step 2: Inspect Each Module for Damage and Compliance
Before installation, every module undergoes a visual and functional inspection. Technicians check for dents, tears in the filter media, or loose components. They also verify that the module meets specified HEPA filtration standards (typically 99.97% efficiency at 0.3 microns). Using calibrated instruments, teams measure airflow resistance and seal integrity. Any component failing inspection is set aside for replacement or repair.
Step 3: Transport Modules to the Cleanroom Installation Area
Once cleared, each module is moved via a custom dolly with pneumatic wheels to reduce vibrations. The route is pre-planned to avoid rough surfaces or narrow passages. Technicians wear full cleanroom attire (bunny suits, gloves, booties) to prevent contamination during transit. The modules are stored temporarily in a clean anteroom adjacent to the main cleanroom wall where they will be installed.
Step 4: Install Modules into the Cleanroom Wall System
The PHSF cleanroom walls have pre‑engineered mounting frames for HEPA modules. Technicians lift each module into place using a ceiling‑mounted hoist or a scissor lift. They secure the module with fasteners rated for the weight and seal the perimeter with gaskets to prevent air bypass. After mechanical installation, electrical connections (if any for monitoring) are made. The process is repeated for all eight units, typically over several days.
Step 5: Test and Validate Air Filtration Performance
After installation, the cleanroom’s HVAC system is turned on, and the newly installed modules are tested. Key tests include:
- Airflow velocity measurement – ensure uniform distribution across the filter face
- Particulate count – compare particle levels before and after filtration to confirm HEPA efficiency
- Seal integrity test – using a DOP or PAO aerosol challenge to detect leaks around frames
- Pressure differential – verify that the cleanroom maintains positive pressure to keep out unfiltered air
All data is recorded and compared against NASA’s cleanliness requirements for the Roman Space Telescope (ISO Class 5 or better equivalent).
Step 6: Prepare the Cleanroom for Telescope Arrival
With the upgraded HEPA system operational, the cleanroom is conditioned to the required temperature and humidity (typically 22°C ± 2°C and 40%–60% relative humidity). Surfaces are cleaned using isopropyl alcohol wipes. Ground support equipment for the telescope – such as workstands and fueling fixtures – is brought in and sterilized. The PHSF team then conducts a full contamination control rehearsal to ensure all protocols are followed.
Step 7: Perform Spacecraft Processing Tasks
Once the cleanroom is ready, the Nancy Grace Roman Space Telescope is moved inside. Within this controlled environment, key operations are performed:
- Spacecraft fueling – propellant loading for the propulsion system
- Instrument checks – final tests on the Wide Field Instrument and Coronagraph Instrument
- Battery charging and electrical testing
- Final assembly – integration of solar panels and other appendages
The HEPA modules continuously filter air during these weeks, maintaining the pristine conditions essential for the telescope’s infrared optics.
Step 8: Transfer to Launch Complex and Integration with Falcon Heavy
After processing, the telescope is encapsulated in a protective payload fairing and transported to Launch Complex 39A at Kennedy. There, it is mated to the SpaceX Falcon Heavy rocket. The cleanroom upgrades indirectly support this phase by ensuring the telescope leaves the PHSF in a contamination-free state. The team targets a launch as early as September.
Tips for Success
- Plan for multiple delivery days – offloading heavy modules takes time; schedule sequentially to avoid congestion
- Label every module – mark each unit with its position to simplify installation and future maintenance
- Conduct a dry run – train staff on lifting and sealing procedures before actual installation to reduce errors
- Monitor humidity – high moisture can degrade HEPA media; keep cleanroom in spec during and after installation
- Document everything – photos, test results, and sign-offs create an audit trail for mission assurance
- Coordinate with launch schedule – ensure cleanroom upgrades are completed before telescope arrival to avoid delays
- Use spare filters – have at least one spare HEPA module on hand in case of damage during installation
By following these steps and tips, NASA and its contractors can ensure that the Roman Space Telescope benefits from a world‑class cleanroom environment – critical for achieving its science goals of exploring dark energy, exoplanets, and the evolution of the universe.