• Simplified installations with multi-speed fans, in- accessible air handlers, fan motors with voltage or phase different from controlled equipment; eliminated wiring to system fan. • Polyester film sail mounted on a micro switch snap switch. • Removable spring counterbalances sail to allow mounting in either vertical (up or down) or horizontal air flow. • Top and bottom conduit knockouts for wiring convenience. • Low air velocity switch operation makes at 250 fpm and breaks at 75 fpm. |