This is based on my initial unboxing, use and setup of the NGT425. I've found that there is an annoying vibrating/knocking noise when accelerating to high speed. This issue was resolved by tightening and tightening the air intake screws with a medium Phillips screwdriver. It should be noted that I tightened all four enough that they were firmly fixed in the plastic, but on further adjustment I backed out the top screw by 50% (limit loosening), and all high-speed vibration stopped. You may have to play around with these screws to adjust the fan accordingly. I'm a longtime Vornado owner and fan (pun intended). I have found over the years that when you need more help, their support in Kansas is second to none. 1-800-234-0604.
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