Duct silencer accessory for in-line blower with 10 inch duct. The VSIL10 may be used to reduce the perceived ventilation sound level at the range hood. For this particular application the VSIL10 should be located between the fan inlet and the range hood. For optimal performance, locate the VSIL10 as close to the inlet of the fan as possible. The VSIL10 may be mounted at any angle, horizontally or vertically.