Using backward curved airfoil impeller manufactured of glass-reinforced polyamide, TFD blower pushes air through with minimal turbulence and noise. Fan includes cast-aluminum impeller hub, epoxy-coated steel housing, flanged and drilled outlet, and ABS inlet cone. Fan, suitable for 0-160°F, is available with single- or 3-phase TEFC motors and CW rotation to 5 positions. Applications include electronic cabinet cooling, heat exchangers, and fume hoods.