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Belt drive plenum fans from Grainger are quieter and more energy-efficient than forward curve blowers. When mounted inside the air plenum, this type of duct fan produces a less turbulent air flow for increased overall system performance. Typical applications for a plenum fan include commercial air-handling systems requiring a compact fan capable of moving high volumes of air at relatively high static pressures and pressurized plenums found in many industrial facilities. Shop a large selection of plenum fans here.