The A2F make pass boxes are one of the safest contains clean zone cross contamination of material in transit. Pass box one door will be open at a time with a electromagnetic interlocking to avoid the cross contamination. UV tube light will be on when both the doors are closed. Dynamic pass box with standard A2F make HEPA (Eff.99.97 down to 0.3m) & A2F make per filter (Assign 90?f.) and Motor Blower assembly in options of 500 and 1000 cfm with UV resistant glass windows validate check inside the pass box.