The plenum boxes connect grilles and square or round diffusers to air duct systems, by mean of flexible ducting of directly to ductwork. The air boxes can be made of galvanized steel or EPS An optional perforated sheet in the inlet of the plenum allows air flow regulation. A standard damper or constant volume damper can be integrated in the plenum box. The plenum box can be made with acoustic insulation to reuce the sound into the system. The diffuser or grille can be fixed or central mounting.

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