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Ok more or less I think I understood, just for confirmation, instead of using "vent flange and vent cover" you simply drilled holes at the base and put some foam to prevent sucking in the dust? I as an aspiration system I would like to use your own, simple and clean, having said that, given the size of the fan you adopted, how many Intake tips to make, because doing the necessary calculations, if the Intake must be 2x larger than exhaust then would you need 12 of Intake or mistake (I considered about 150cm2 for the wall / panel-mount HEPA + active carbon filter and 25cm2 for the Intake)?