1. Introduction - NIH 3D Print Exchange | A collection of ...

IT IS BEST THAT THE USER OF THE MASK PERFORM THE NEXT STEPS TO PREVENT CONTAMINATION. Cut out an approximately 3.5 x 4.5” square of filter medium. If you’re using the F1 sized Filtrete True HEPA Filter material, you should be able to cut 3 “folds” worth of filter material in half. Step 13. Lay the filter cutout on the front of the mask. ................
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