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Product Features: * High quality plastic cased RVK fan; * Diameter: 4" 100mm; * Max Airflow: 175m3/hr; * Speed-controllable (using a Primair Fan speed controller); * Integral thermal contacts with electrical reset; * Can be installed in any position; * Maintenance-free and reliable; * Manufactured from fibreglass reinforced plastic; * The RVK fan brackets (supplied) allow for easy installation to the floor, wall or ceiling - and removal; Product Specification: * These german made extraction fans are low wattage, high output and designed to handle both low air volume hobby use and high air volume commercial use; * These fans can be run constantly without any problems; * RVK extraction motors are very quiet. However, if the noise from the airflow is too loud, purchase one of silencers and place at one end with a carbon filter on the other end;