Extraction Fan System - Ortur Laser Master 2 - Ortur Lasers

Hi there, Recently I purchased the Ortur Laser Master 2 (20w) and now im looking at building a custom enclosure for the engraver, with some sort of fume extraction fan system connected with a flexible hose leading out the window. Regarding the extraction fan system, can anyone suggest a relatively cheap method, (eg. bathroom extraction fan and would it be enough to expel all fumes) Also would standard Orange coloured acyrlic block all harmful rays from the laser when looking at it directly? T

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