EventHorizan
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I doubt it has anything and you are pulling thru it... I think i would worry more about exhausting the light so you can keep it a lil closer comsidering your canopy is no bigger than 4x4 and you have a vewry very good hood...Also I think I would want a new can/carbon filter. There's no way for me to know if it has bugs in it or anything. Everything else I was able to clean with alcohol. It was attached to the fan when he gave it to me so I just took the whole thing.
just my opinion...