Enginias Inc. incorporates INVC developed noise control techniques and technology into machines, production lines and other plant to reduce noise levels at source. Enginias Inc. uses the latest version of INVC award winning fan noise control technology under its license to reduces tonal noise at source at a fraction of the cost of traditional techniques such as silencers and enclosures. It achieves this noise reduction without the increased power consumption associated with conventional silencers, lasts the lifetime of the fan without maintenance and can be retro-fitted with little down-time. Applications include: extract fans, ID fans, chillers, air conditioning plant, process and ventilation fans, HVAC systems, power stations, cement and steel works and most fans where there are low frequency noise issues.