Have you cleaned the bottom section of the fan? I’ve seen one so chock-block full of dust that the motor could barely rotate the impeller. Seems like Dyson just stuck a vacuum cleaner to a fan ring. I’ve posted instructions on how to open and clean up the bottom section at the link: https://www.instructables.com/id/Dyson-AM07-Bladeless-Fan-Disassembly-for-Cleaning-/

Try to clean the blower section of the fan. Dyson fans are notorious for getting clogged with dust at the bottom section and the turbine blades. This may be causing the motor to work extra hard resulting in the noise I have posted an article on how to do this at the following link: https://www.instructables.com/id/Dyson-AM07-Bladeless-Fan-Disassembly-for-Cleaning-/

https://www.instructables.com/id/Dyson-AM07-Bladeless-Fan-Disassembly-for-Cleaning-/ Please see the above article I posted on how to take apart and clean the internals of a Dyson tower fan.