The purpose of Standard 145.1-2008 is to provide a standard laboratory test method for assessing the performance of loose granular media used in gas-phase air-cleaning systems. This standard outlines a test procedure with quality control constraints to develop a performance metric using percent removal efficiency and removal capacity of a small media sample when it is challenged under steady-state conditions by a number of gaseous contaminants. Two groups of chemical contaminants are prescribed (the acid gas challenge group and the volatile organic compounds challenge group), and the user may select one or both of the groups for testing. The results of these tests can provide information to the engineer useful for the design and selection of air-cleaning equipment and the design of air-cleaning systems for controlling indoor concentrations of gaseous air contaminants.

This standard prescribes a small-scale laboratory test method for measuring the contaminant removal efficiency of loose granular sorptive media used in gas-phase air-cleaning equipment as installed (in a test apparatus) in an airstream and challenged with test gases under steady-state conditions. This test is conducted at elevated gas challenge concentrations (relative to ventilation applications) and therefore should be used to compare media rather than directly predict performance in any particular application. This standard defines methods of calculating and reporting results obtained from the test data and establishes a results reporting system that can be applied to loose granular media covered by this standard. This standard does not apply to bonded carbon panels, beaded activated carbon, carbon cloths, absorbent-loaded nonwovens, dry-process carbon composites, or similar products or to particulate removal equipment. The results obtained using this method cannot be used to predict the performance of sorptive media gas-phase air-cleaning devices or installed systems.

Keywords: gaseous air contiminants, air-cleaning system, gas-phase air cleaning system, testing gas-phase air cleaning equipment, loose granular media

Units: Dual