This proposed standard is to provide a uniform method of test for residential self-contained system humidifiers in a laboratory environment. Although the method of test originated in ANSI/AHRI Standard 620-2004, Performance Rating Of Self-Contained Humidifiers For Residential Applications, the committee has developed this separate method of test to be used independently of the AHRI rating standard so manufacturers, specifiers, installers, and users of central system residential humidifiers can test a humidifier's capacity under a variety of conditions with uniform results.