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The Filter Service Life Estimate calculator (FSLE) provides an estimate of how long filters may be used before they need to be changed.

This program estimates the service life for Organic Vapour filters with a boiling point >65°C (not particle filters). A combination filter is needed if the contaminant also exists in particulate form.

The FSLE is calculated by using the information specified by the user of this online form. The information includes the types of contaminant exposure, the types of filters used and the conditions of use. Failure to input the correct information may result in improper respirator use resulting in sickness or death. An appropriate filter replacement schedule - such as application of work, work rate and other environmental conditions at the workplace - should also be taken into consideration.

This form must be completed by a representative of the organization requesting the certificate.

The FSLE applies to the CST ULTRA and CST PRO respirator units only. Please contact your CleanSpace representative for assistance with any other filter queries.

Thank you for your request. A member of the CleanSpace team will be in contact with you as soon as possible.


CleanSpace Technology makes no warranties, understandings, or representations, whether expressed, implied, or statutory regarding the Filter Service Life Estimate (FSLE) calculation. The FSLE provided by CleanSpace serves as a guideline only and is in response to the information specified by the user at the time this form was submitted. Please refer to current national and local standards for detailed information about respiratory protection requirements.

A site risk assessment by a health and safety specialist should be undertaken to determine the level of exposure and the filter replacement schedule. CleanSpace always recommends that the customer consult with a health and safety specialist if personal protection policies are not in place.

CleanSpace specifically disclaims any warranty for merchantability or fitness for a particular purpose. In no event shall CleanSpace or anyone else who has been involved in the creation, production, or delivery of this website be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use of or inability to use this respirator selector or for any claim by any other party.

This online form is for air purifying filters only. Do not use in the following conditions:

  • Exposures that exceed the Maximum Use Concentration.
  • Exposures that are Immediately Dangerous to Life and Health
  • In confined spaces.
  • When oxygen concentration is less than 19.5% (or any other limit set by local or national regulations).

The Filter Service Life Estimate certificate as provided by CleanSpace only applies to the CleanSpace filter stated in the certificate.

Do not use the information provided by the CleanSpace FSLE calculator for filters not stated in the certificate, including filters provided by other manufacturers.

The FSLE certificate provided by the CleanSpace FSLE calculator is an estimation and should be used with caution.

The FSLE certificate serves as a guideline only and is based on information provided by the user of the FSLE calculator at the time this form was submitted. For this reason, CleanSpace will only provide FSLE information directly to the end user organisations or their authorised safety consultants.

The CleanSpace FSLE calculator should not be used as the sole source of information when determining a filter replacement schedule.

A proper filter replacement schedule should also be based on the application, work rate, and environmental conditions at the workplace. Improper use of respiratory devices may result in severe consequences, including health problems, and eventually death.

There are chemical hazards that have an odour threshold lower than their Occupational Exposure Limit (OEL). If the selected filter breakthrough concentration is greater than the odour threshold, the user will detect the hazard even though it is below the OEL and before the estimated end-of-service life of the filter. Users MUST exit the area and follow the worksite's protocol for filter replacement in this situation.

Selection and use of filtering respiratory protection devices are the responsibility of the user. Therefore, the liability of CleanSpace only covers the consistent quality of CleanSpace approved products. Depending on the country of use, the applicable National Regulations and guidelines should be followed.

Conditions affecting filter end of service life.

All factors that may influence respiratory protection should be considered, including specific work practices and other conditions unique to the user's environment.

The following is a partial list of factors which may affect the usable filter's service life. It may also affect the degree of respirator protection attainable under the actual workplace conditions which are not considered by the FSLE calculation.

  • Changes in contaminant concentration, humidity, breathing rate, and temperature
  • Accuracy in the determination of the conditions
  • Filter storage conditions (exposure to trace levels of contaminants, humidity, and elevated temperatures)
  • Age of the filter
  • Condition of the filter and respirator
  • Respirator fit
  • Respirator assembly, operation, and maintenance
  • User training, experience, and medical fitness
  • Other conditions specific to the user and/or workplace

Failure to follow the above warnings can result in serious personal injury or death.

Note: The contaminant breakthrough concentration shall be: 1. Less than or equal to 50% of the Workplace Contaminant Concentration (ppm), AND; 2. Greater than zero.

Operator Exertion Table

Note: Please contact [email protected] if this enquiry relates to a CleanSpace respirator not listed below.