Class I Biosafety Cabinet is Class I type of Biosafety Cabinet suitable for work involving low to moderate risk agent biosafety Levels 1, 2 and 3. It has 99.999 % efficiency at 0.3 μ m HEPA Filter and offers LED 4 W × 1 illuminating lamp. Equipped with negative pressure, personnel protection is made possible by constant movement of air into the work area. It does not protect the product from contamination because un-purified room air constantly enters into work area.