Offering a quiet solution for continuous ventilation needs, this high-capacity, low-vibration fan is ideal for conference rooms, public restrooms, and other commercial building applications. It can be ducted horizontally or vertically, and in-line ducting is available with a separate adapter. Features include a heavy-duty motor, sound-absorbing acoustic insulation, and a single, impact-resistant centrifugal blower wheel. Use an electronic variable speed control, available separately, to adjust blower speed and sound level.