An environmental test chamber, and method of providing an environmental test chamber, includes combining an equipment module made up of an equipment housing and air treatment equipment in the equipment housing with a selected one or more of a plurality of chamber modules connected with the equipment module to provide the environmental test chamber. The equipment housing includes an opening defining an airflow passage and an airflow path extending to the airflow passage. The air treatment equipment includes air moving equipment flowing air along the airflow path through the airflow passage and air-conditioning equipment in the flow path. The air treatment equipment includes one or more of (i) heating equipment for selectively heating the flowing air, (ii) cooling equipment for selectively cooling the flowing air, (iii) humidification equipment for selectively humidifying the flowing air, and/or (iv) dehumidification equipment for selectively dehumidifying the flowing air. A plurality of chamber modules of different sizes from each other are provided. Each of the chamber modules has a chamber housing with an opening defining an airflow passage in the chamber housing that aligns with the airflow opening in the equipment module and an access opening that is selectively opened for accessing an interior of the chamber module. In this manner, the one or ones of the chamber modules that is connected with the equipment module determines a configuration of the environmental test chamber.
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