Fume hood air filter

This air filter is made to take a round filter from a dust mask.
a 40 mm fan on one side pushes the air through the filter.
link to fan bellow:
http://www.dx.com/p/maitech-4-x-4cm-dc24v-0-13a-frequency-converter-cooling-fan-black-309251#.VCbPAGddWaI
hope you like