... of centrifugal wind, running quiet, Safe, reliable, long-lasting: each coil have been pressure tested out of plumbing (Set head), by ... ,000 hours and above.2.High efficiency, energy Foot: Purple coil using seamless steel string sets efficient two-way aluminum fin ... affluent. 3.Full-featured, easy to use: a third gear unit wind speed (high, medium, low , simple operation, easy to use ...