Rotron Inverted blowers are compact, sturdy, light weight and designed for a long, maintenance-free life. Inverted blowers have their driving motor located inside the squirrel cage wheel. This results in exceptional compactness and excellent motor cooling. Inverted Blowers come in a variety of voltages and frequencies. Most units are available with an optional internal Fan Performance Sensor (FPS) or external Low Speed Warning Device (LSWD). Units are available in standard and reduced size.