Apparatus for heating, drying and ventilation, namely, ventilating exhaust supply fans, ventilating exhaust fans, ventilating fans for commercial and industrial use, electric duct fans, electric wall fans, dryer exhaust duct power ventilators, electric radial fans, electric axial fans, electric centrifugal fans, electric mixed flow fans, electric tangential fans, electric propeller fans, roof ventilators for use in commercial and residential buildings, power venters, draft inducers, ceiling f...