Remote Sampling System for HEPA (1500 Cfm) in-Place Filters with a Fluid (Channel) Seal System

摘要

The most important consideration in measuring the toxic risk in an air-moving system is to obtain a representative sample of the air and the toxic agents moving in the air stream. This paper describes the use of a commercially available system for sampling the air moving through high efficiency particulate aerosol (HEPA) filter units. These units consisted of a ''crab trap,'' a separatorless filter with a channel (fluid) system seal, and a specially designed air injection and sample probe system. The probe was found efficient for use in a turbulent or laminar flow duct using a monodispersed or polydispersed aerosol from 0.3 to 10 mu in diameter. This type of system provides longer filter life, reduces testing time, reduces possible personnel exposures, and enables accurate sampling in areas where accessibility is poor. (ERA citation 04:001315)