Made in UK Variable direction discharge, backward curved centrifugal fan. High-efficiency IE2 external rotors motor and IE3 for induction rotor motors. The highest quality Electric motors with thermal protection will guarantee a long life and trouble-free operation due to their construction and air cool system. Aco-silent fans can be used as extract and supply units. Galvanized steel with Aluminium profile edging. Plug & Play Fan and Inverter Speed Controller Package. Dynamically Balanced Backward curved centrifugal Impellers to reduce dirt accumulation. Motor overload protection is provided by pre-configured VFD. Includes fireproof insulated interchangeable panels. Low noise levels.