Growing in a Tent with No Ventilation...

If noise is your main concern, why not make your own 'silencer'?

Cardboard / wooden box. drill two holes either end for extraction
Fill the box with fibreglass / rockwool / sound proofing sheets - choose a medium to absorb the sound.
Tightly compact your medium around the fan with tape.
Fill the box with your medium - leave enough room to fit your fan in the box. Ensure the fan is not touching any part of the box - your medium should completely surround the fan. Suspend in the tent and your done, a silent system!
 
I have 3 tents in my bedroom. silent grow. oversize AC infinity fans so you only have to run on speed 1 or 2 and if u get the controller model,, u can set so the exhaust only kicks on when triggers are hit.. get quality fans for inside the tent. (I prefer Lasko). if they start to make noise, take them apart and grease them up. good airflow also helps make strong branches, keeps pests under control, and obviously help w too much humidity and pm issues.
 
Get a squirrel cage fan, very quite :bigjoint:


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