The governor can adjust the size of the wind inside the machine and turning off the blowerMotor copper coil thickening thickening wind is 1 times larger than ordinary modelsCapacitor start to extend motor lifeCast iron casing, durable and durable, pure copper core motor, power cord lengthened to 1.8 metersDouble bearing motor with high efficiencyOutlet OD: 40w: 3.9cm, 60w: 4.3cm, 80w: 4.6cm, 100w: 4.7cm, 120w: 4.9cm, 150w: 5.3cm, 200w: 6.3cm, 250w: 6.5cmAir volume: 40W: 1.07m3/min, 60W: 1.63m3/min, 80W: 2m3/min, 100W: 2.2m3/min, 120W: 2.5m3/min, 150W: 3.2m3/min, 200W: 4.5m3/min, 250W: 5m3/minWind pressure: 40W: 200Pa, 60W: 240Pa, 80W: 240Pa, 100W: 330Pa, 120W: 380Pa, 150W: 490Pa, 200W: 540Pa, 250W: 550PaSize:40W: 18.5*17.8 cm, 60W: 20.5*19 cm, 80W: 21.8*20.1 cm, 100W: 24*21cm, 120W: 26.5*22.8 cm, 150W: 28*25 cm, 200W: 30*27 cm, 250W: 32 *29 cm