Dimensions and technical details 220-240 V ~ 50/60 Hz Various options available TT Silent M 150 V: integrated speed control (2 speeds / off) TT Silent M 150 T: adjustable time delay (2 - 30 minutes), no speed controller TT Silent M 150 U: integrated speed control (2 speeds / off) with electric thermostat and temperature sensor inside the duct, temperature-controlled operation, lead wire with IEC C14 plug Housing colour: black Housing material: powder-coated steel, 50mm mineral wool layer for sound and heat insulation, inside and impeller made of high-quality synthetic material Nominal size: 150 mm Wattage min./max.: 45 / 52 W Current consumption min./max.: 0.2 / 0.23 A Revolutions per minute min./max.: 1970 / 2645 Sound pressure Lp-3m min./max.: 26 / 33 dB(A) Airflow rate min./max.: 405 / 555 m³/h Max. temperature for continuous operation: 60°C IP rating: IPX4 Weight: 6.1 kg Thermal.