High performance: Duct fan 100 mm, power 40 W, speed 2800 r/min, air volume: 310 m³/h. Based on the rechargeable design of the fan blades of a jet turbine motor, it provides stronger passage fan winds and reduces the noise caused by high air speeds by . 30 db. Adjustable speed: This adjustable duct fan remote control offers two speed settings to reduce the maximum power of the duct fan from . The wireless speed switch has an range of up to 25 metres in open areas and up to 15 metres through walls and doors. Battery powered, no wall wiring required for greater convenience. Copper wire motor: The duct fan is heat with a full copper wire motor, a source of high airflow, stronger and more than fans of the same power. Fan casing is made of high quality ABS material, oil, moisture and , MTBF up to 30,000 hours, Suitable for placement at air temperatures from -20℃ to 60℃. Easy to install: the heater's exhaust fan has a modular design for quick disassembly and easy maintenance, and a 1 metre