1、2014 ASHRAE. All Rights reserved. Page 1 of 1 INTERPRETATION IC 52.2-2012-1 OF ANSI/ASHRAE STANDARD 52.2-2012 Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size Approval Date: September 22, 2014 Request from: Bruce McDonald (), Consultant, Voting membe
2、r of SSPC52.2, 1826 13thAve. West, Shakopee, MN 55379. Reference: This request for interpretation refers to the requirements presented in ANSI/ASHRAE Standard 52.2-2012, Section 4.3, regarding the test aerosol used to measure fractional efficiency. Background: Recently in the industry, there has bee
3、n a claim that a newly developed methodology of particle generation that produces “quasi-solid particles” can be used to increase filter performance of HVAC filters by up to three higher MERV numbers in an ASHRAE 52.2 test. Those using this “quasi-solid particle” methodology claim that the test is c
4、onducted in accordance with ASHRAE Standard 52.2. Interpretation: Only solid-phase, dry potassium chloride (KCl) particles shall be used for fractional efficiency measurement per ASHRAE Standard 52.2-2012. Tests conducted with any other aerosol are not conducted in accordance with Standard 52.2. Que
5、stion: Is this interpretation correct? Answer: Yes Comments: The standard is very clear on this in Sections 4.3.1 and 4.3.2. Section 4.3.1 of ANSI/ASHRAE 52.2-2012 states, “The test aerosol shall be polydisperse solid-phase (dry) potassium chloride (KCl) particles generated from an aqueous solution”. Section 4.3.2 of ANSI/ASHRAE 52.2-2012 states, “The aerosol generator shall be designed to ensure that the KCl particles are dry prior to being introduced into the test duct.”
