Hello I have made a carbon filter of a petshop airpump and som activecoalpellets. Here are some pics. The pump is a bit to weak 1L/min but they are cheap (10 Euro) and you find up to 700l/h and that`s enough for a small grow I think. So if heat is not your biggest issue but smell is then this could be a last resort. English is not my native language so sorry for any misspelling.
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