I thought it was quiet until I used my m9. Wow the air 1 is super loud! I don’t really care because I work from home so I don’t think anyone will be able to hear it. But I have to cover myself with a blanket to drown out the noise 
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I don’t think it’s loud bc I have louder ones. But my husband did say the other day wow those things are loud so I think I drown them out lol
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I’m trying to think of all the names my husbands uses for them. He calls them my coffee makers lol. I’ll think of the others..
RIGHT! That’s my only qualm with it I love my Air1 but boy can they make some noise hahahahah
I don’t notice a difference between the air 1 and M5 and M6.
Ah ok I haven’t used those ones before. My eufy is just as dang loud ! Louder than my air 1 actually
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Oh wow! They should make a more quieter one that way pumping can be mostly invisible 