A hard-lid ceiling diffuser is mounted within a gypsum board ceiling and connected via an opposed blade volume damper and a maximum five-foot flexible duct to a metal ninety-degree elbow and rigid sheet metal duct secured to the structure above. An exterior wall intake louver assembly consists of sixteen-gauge fixed blade louvers, one-inch thick disposable filters, and a twenty-four-gauge sheet metal plenum with a one-quarter-inch mesh wire screen set against an exterior concrete panel. The filter framework must fit tightly inside the louver rough opening, with exact sizes and locations referenced on the architectural plans and elevations.
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