Patented ROOTS-FLO blowers are heavy duty rotary units in a compact, sturdy design engineered for reliable pneumatic conveying of grain and similar product. The basic model features a ribbed cast iron casing and ridged headplates, carburized and ground alloy steel spur timing gears secured to steel shafts with a taper mounting and locknut, and cast iron involute impellers. Oversized anti-friction bearings are used, with a cylindrical roller bearing at the drive shaft to withstand V-belt pull. Detachable rugged steel mounting feet permit easy in-field adaptability to either veritcal or horizontal installation requirements. The ROOTS-FLO is splash lubricated from oversized oil reservoirs. ROOTS exclusive gearbox design improves oil distribution and lengthens bearing and gear life.