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Ive got a space heater s9 myself. I get about 40 decibals so similar to yours sounds like but sometimes i can hear this different frequency humming sound...kinda like a lower tone bell-esque sound which i can hear much more throughout the house. Do you get that?
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Derek Ross 2y ago

Make sure all of your screws are tight. It could be a fan rattling. It could also be a lose or bad ball bearing in the fan. They're easy to replace.

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deleted 2y ago

The fans are new so i dont think its that. I zip tied the fans on as i didnt have appropriate screws. Ill look into that 🙂

12
deleted 2y ago

Wasnt able to pinpoint the source of the low hum but by investigating, noticed my power supply fan isnt working ( seems the frame got compressed and the fan blades started hitting the sides must have broken from the friction).