A method of modifying a modular work station including removing at least one lower panel element from one of a plurality of modular wall sections and removing an air collection unit from one of a plurality of modular walls. Installing the air collection unit where the lower panel element was removed. The air collection unit is configured to match the profile of the lower panel element such that the air collection unit could be installed in any of the plurality of modular wall sections in place of the lower panel elements. The modular wall section height is also adjustable and includes a ceiling assembly.