ANSI/ASHRAE Standard 185.3-2024 establishes a test method for evaluating commercial and industrial in-room air-cleaning devices and systems for microorganism bioaerosol removal or inactivation in a test chamber.

This standard:

1. Specifies selected indicator microorganisms in the test chamber and defines procedures for generating the bioaerosols required for the method of test.
2. Provides a method for counting the number of viable microorganisms in the chamber to calculate the elimination efficiency for each microorganism.
3. Establishes minimum performance specifications for the equipment required to conduct the tests, defines methods of calculating and reporting results obtained from the test data, and establishes a reporting system to be applied to in-room devices and systems addressed by the standard.