Filter Holder

CH Technologies offers the 25, 35 and 47mm Filter Holders that have been the standard general purpose filter unit for a wide variety of scientific sampling applications for over 40 years. This design originated in the air filtration research department of a major university and has been the quality standard for this type of device since 1962.

The key to this device is the application of the overlapping seal principle combined with a very open pore, etched stainless steel screen.

The 25mm and 37mm Filter Holders were developed to meet constant requests for these other two standard sizes. The overlapping seal principle has been retained. While the 47mm models have always been threaded 1/4" NPT, the 25 and 37 mm models use 1/8" NPT to support their reduced dimensions.



  • Anodized Aluminum Construction
  • Eliminates Internal & External Leakage Problems
  • Furnished with sample adaptor
  • Toxicology
  • Inhalation Exposure
  • Duct Sampling
  • Occupational Hygiene

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