1.1 ,Specification D3924 defines a standard environment of 23 ±, 2°,C and 50 ±, 5 ,% relative humidity and free from drafts for normal conditioning and testing of paint, varnish, lacquer, and related materials. This practice describes a test chamber that allows for control of relative humidity above the ambient relative humidity and minimization of air flow for conditioning of test panels at elevated relative humidity and room temperatures.