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4. A riser structure for vocal music and band ensembles comprising: a plurality of platforms spaced vertically apart from each other; an inner chamber defined by a front wall, back wall and side walls that are sealed against the plurality of platforms within a volume disposed below the plurality of platforms; a shroud disposed along the back wall, the front wall, and the side walls of the riser structure, the shroud comprises of a top portion that is fixed to the back wall, and extending to a height above a top one of the plurality of platforms, at least one air intake in flow communication with the inner chamber, the at least one air intake disposed within a vertical space between at least two of the plurality of platforms; an airflow generator in flow communication with the inner chamber and configured to generate a pressure within the inner chamber that is lower than a pressure above the plurality of platforms to generate a localized downdraft airflow through the at least one air intake into the inner chamber; at least one filter disposed between the at least one outlet of the inner chamber and the airflow generator, the at least one filter is provided for removing particulates within an airflow drawn though the outlet; and a duct in flow communication with the inner chamber and configured for directing air drawn into the air intake away from the riser structure.
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