youll see the tent sides pull in when you start fan up.
tbh i think you might struggle with just a 4" extract specially if theres lots of duct/bends to push through,i should imagine itll have to be flat out all the time,which if its a cheap end one will kill it fairly quickly,plus itll be noisy i spect.
i have a70x70x160 tent and i definately need the present 6" in there.
usb fans are only any good for gentle breezes for plants in tent .
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