HEPA, ULPA, filter bank modules
Cleanroom filtration systems, appropriately designed to work in conjunction with the air handling system, deliver the particulate free environment required by high quality process functions. The filter type, filter airflow, and filter placement in the cleanroom system will ultimately determine the ISO cleanliness classification of the cleanroom environment.
Airflow cleanliness classification is an accomplishment of filter coverage, airflow rates of exchange, and filter media type. The amount of filter coverage and airflow will also determine the cleanroom recovery rate.
Cleanroom Filtration Modules:
Cleanroom filtration design should be dictated by the process and process equipment to be installed in the cleanroom environment. Typical tables for and air changes required typically are based on an empty cleanroom at rest. Depending on the process and procedures that will take place in the cleanroom environment the correct amount of filter coverage and air changes can increase. Engineering should take into account the process, process equipment, number of personnel, amount of entry and egress, and ambient environment when determining the final filter coverage and air change rate. Air cleanliness should also be tested at operating levels to assure compliance with the specifications.
Cleanroom filter maintenance depending on the filter installation can be a time consuming process leading to excessive downtime with some lower cost filtration units. Filters are tested by a series of procedures defined in ISO 14644-1, ISO 14644-2, and ISO 14644-3 specifications by the Institute of Environmental Sciences and Technology(IEST). To minimize downtime for testing and maintenance it is recommended that you utilize only room side replaceable(RSR) style modules.
Cleanroom filtration systems should be designed and engineered to match the process they are specified for. Various cleanroom environments and processes dictate specific types of filter efficiencies be in place to meet certification and validation requirements.