What device is used to collect air samples for asbestos monitoring with 25 millimeter filter cassettes?

• A. 25 millimeter filter cassettes
• B. 5 millimeter filter discs
• C. 45 millimeter filter swatches
• D. 100 millimeter filter jars

Answer: (A)

Air sampling for asbestos hinges on drawing a known volume of air through a filter so fibers are captured for lab analysis. The 25 millimeter filter cassette is the standard device used to collect that air sample when employing 25 mm cassettes, because it provides a consistent sampling geometry and is compatible with lab methods (PCM/TEM). This format fits typical sampling heads and pumps, enabling accurate fiber counts. The other options aren’t the standard collection device in this setup, as they refer to nonstandard sizes or forms for this purpose.