6 Inch Inline Duct Fan with Wired Smart Controller 311 CFM

Air Speed Selection:three-speed engine with NMB ball bearing, more than 50,000 hours of operation.Press the high / medium / low button to select the speed. Timer Set:Switch on the controller, short press the delay button once to delay 1min, and add 1 min every time you press the button, 30 minutes in total. Long press the delay button to cancel the timer function. Temperature monitoring:switch with temperature sensor Always monitor the room temperature. Shell:PC+ABS flame-retardant plastic Note:This duct fan is with 0.8m power cord, no plug, need wiring. Controller is with 2.5 meter wire. Parameter 6?Inch/150 mm Speed Dimension 315*220*228 mm High/Medium/Low Power Supply 220~240V/50 Hz Current 0.22 amps H 0.20 amps M 0.19 amps L Power 54 W H 48 W M 44 W L Speed 2550 RPM H 2150 RPM M 1850 RPM L Air Flow 530 m3 / h H 470 m3 / h M 410 m3 / h L Air Pressure 300 Pa H 270 Pa M 240 Pa L Noise 33 dB H 31 dB M 29 dB L Net We