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High-quality EC motors operate smoother, reducing vibration-related noise by 10% versus AC motors. Low-rpm designs (1,200–3,600 RPM) produce less noise than high-speed models, though they may sacrifice airflow. Variable speed controls, via VFDs, allow lower speeds in quiet settings, but improper calibration risks instability. Housing and installation impact noise. Cylindrical casings with guide vanes reduce turbulence, cutting sound by 5 dB. Guard grills, while protective, increase noise by 2–3 dB due to airflow obstruction. Secure mounting with vibration-dampening materials, like rubber gaskets, minimizes mechanical noise. In one case, optimized installation reduced workshop noise by 10 dB. Applications demand tailored solutions. In HVAC systems, axial fans with low-noise blades ensure quiet operation in commercial buildings. Data centers use compact, low-rpm fans to cool servers without disturbing staff. 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