Ashrae Standards <br/><br/>
ASHRAE 52.2-2017 : STANDARD 52.2-2017 -- METHOD OF TESTING GENERAL VENTILATION AIR-CLEANING DEVICES FOR REMOVAL EFFICIENCY BY PARTICLE SIZE (ANSI APPROVED) 

 -  ASHRAE   2019-09-13 
<br/><br/><label>Dewey Class. No.: </label>621.3  / ASH