Cleanroom Filtration

Filtration is the process of removing solid particles in a gaseous fluid or liquid via a filter medium, which allows fluid to pass through whilst retaining the solid particles. The fluid that passes through is the filtrate. Filtration occurs both in nature and engineered systems.

In a cleanroom, air filtration is important for achieving the desired classification of cleanliness. Stringent high standards across most industries usually require extensive filtering, high fresh air rates, humidity and temperature control. The higher the class of cleanroom, the more air that needs to be filtered.

Air supply in and out of the cleanroom is filtered via a system that’s certified and conforms to international regulations that govern air filtration. This standard also determines testing methods to classify filters in their respective categories.

Modular Cleanroom Benefits

  • Modular Construction
  • Quick Assembly Time
  • Versatility
  • Reconfiguration
  • Airflow Control
  • Inexpensive Modifications

Types of cleanroom filtration

Pre-filters

These filters remove particulates in the air (such as larger particles) before it reaches ULPA or HEPA filters. It usually works in combination with a HEPA filter to extend its lifespan and reduce the workload of the HEPA filter.

It’s advisable to change your pre-filters six times a year to ensure it runs smoothly and prevents contamination of the cleanroom system.

Cleanroom Design, Build & Validation

  • Budgeting and planning
  • Engineering, design & layout
  • Airflow and filtration design
  • Construction and Installation
  • Full Certification of our product
  • Industry-specific equipment installation
  • Validation

HEPA filters

A High-Efficiency Particulate Air filter is a major component of a cleanroom design that minimises sound output and maximises operating efficiency and contaminant reduction.

Air is cooled, heated, dehumidified or humidified by the HVAC system before entering the cleanroom and passing through HEPA filters to remove all particles. This ensures minimum particulate contamination in the cleanroom.

The type of HEPA filter used in a cleanroom is determined by the cleanroom design. Ducted or non-motorised HEPA filters work with a central air handler that provides humidity control and temperature control. Fan-powered or motorised HEPA filters are more common and are a primary feature for dual ducted designs.

The fan powered module (FFU) is supplied in an aluminium or steel housing; 2’ x4’ is the most popular size, but a 4’ x4’ and 2’ x 2’ are also available. An energy efficient motor blower is used to power the unit. Units are available in 208-230 volts, 115 volts and 227 volts.

The HEPA filter’s longevity depends on how it was used. Under normal design, the filter should be replaced when the pressure drop is two times the initial pressure drop. For industries with more stringent regulations such as medical devices, food processing and pharmaceuticals, filters should be changed every five years. Features of the HEPA filter include:

  • Removes micron particles 0.3 microns or larger in size
  • Air flow of 650 cfm
  • Air velocity of 90 fpm
  • 99% operating efficiency

Total Clean Air supplies high-quality HEPA filters with a shelf life of up to 10 years when used correctly. This means the filters are stored according to our recommendations and not subjected to extreme temperatures. We also offer a room-side replaceable option; this allows us to replace your HEPA filters by removing them from inside the cleanroom.

Total Clean Air supplies high-quality HEPA filters with a shelf life of up to 10 years when used correctly. This means the filters are stored according to our recommendations and not subjected to extreme temperatures. We have an array of ducted filters and FFU filters, made to the exact requirements of your particular industry.

ULPA filters

An Ultra-Low Particulate Air filter removes 99.999% of pollen, dust, bacteria, mould and any airborne particles with a size of 100 nanometers or larger. They are recommended for manufacturing environments that require very clean air.

ULPA filters provide an ISO Class 3 work zone, leading to better product protection. ULPA filters also reduce the risk of product contamination and operator infection. Therefore, companies subsequently save money on potential product cost failure.

When compared with a HEPA filter, a ULPA filter doesn’t necessarily make the best choice, purely because it filters more particles. The determining factor is in fact air changes per minute (ACH), which measures the number of times that air is changed or filtered out in a cleanroom.

Total Clean Air can help determine which filter will meet your cleanroom containment regulations, based on your industry and application.

Features of the ULPA fan filter include:

  • Removes particles 0.12 microns or larger in size
  • Air velocity of 90 fpm
  • 999% operating efficiency
  • Air flow of 650 cfm

Industries that use ULPA filters

  • Food processing
  • Hospitals
  • Laboratories
  • Microelectronics
  • Nuclear research labs
  • Pharmaceuticals

Call Total Clean Air today for the best air filtration system

Both ULPA and HEPA filters are housed in filter modules that are mounted on walls or ceilings. The filter installation must be handled by skilled personnel at Total Clean Air to prevent potential leakage from new filters. We can answer all your cleanroom questions and provide a free quote to start you on the road to achieving the required classification for your cleanroom.

phillip.godden
Phillip Godden

Phillip Godden is the Founder & Chief/Executive Officer at Total Clean Air.

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