Quote:
Originally Posted by RollTider420
This might be stupid question but i cannot find an answer. I have a 4" inline fan with a carbon filter, but do not know what to connect them with. Do I need a some kind of flange or something. any help is appreciated.
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need flexiable ducting(silver) which connects to the both sides of your rvk fan & then connect to your carbon filter ,joining fan to filter & enough ducting to go outside your grow area to vent where you want it to go

jubilee clips to join them together.
easy as that mate.
hope this helps

M.