The NEBB Professional 2024 - Quarter 3

CPT Option 2, Optical Particle Counter for Scan Test Change: • Add "at least" in front of "a 1.0 cfm flow rate." Old 2024 Verbiage: A particle counter should have a 1.0 cfm flow rate with a threshold sensitivity of at least 0.3 µ m. The counter must have an audible alarm for every particle that is counted. The particle counter shall have a continuous counting mode or a sample time that exceeds the time required to completely scan the area of the filter un der test. This counter may also be used for Cleanliness

that is counted. The particle counter shall have a con tinuous counting mode or a sample time that exceeds the time required to completely scan the area of the filter under test. This counter may also be used for Cleanliness Classification above. CPT Option 2, Diluter Change: • Remove "shall" and add "should." Old 2024 Verbiage: A device used with the scanning particle counter to sample the aerosol challenge upstream of a filter under test. The dilution ratio shall be between 300 – 1,000:1. The resulting counts after dilution should not exceed 100,000 particles. New 2025 Verbiage: A device used with the scanning particle counter to sample the aerosol challenge upstream of a filter un der test. The dilution ratio should be between 300 – 1,000:1. The resulting counts after dilution should not exceed 100,000 particles. CPT Option 2, Aerosol Generator Change: • Remove "A low output (defined as one that supplies of < 5 x 10-9 particles/min of > 0.3 µ m in size), or a normal output generator may be used." Old 2024 Verbiage: A device that can aerosolize oil or microsphere medi um to serve as an artificial challenge for filter integrity testing. A low output (defined as one which supplies < 5 x 10-9 particles/min of ≥ 0.3 µ m in size) or a normal output generator may be used. New 2025 Verbiage: A device that can aerosolize oil or microsphere medi um to serve as an artificial challenge for filter integrity testing. These changes will be reflected on the (effective January 1, 2025) Instrument List when it is posted on the NEBB website before the next recertification cycle begins.

Classification above. New 2025 Verbiage:

A particle counter should have at least a 1.0 cfm flow rate with a threshold sensitivity of at least 0.3 µ m. The counter must have an audible alarm for every particle

The NEBB Professional | Quarter 3 | 2024

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