Produced by ALS the CTH C2 is a triple absolute filter cabinet and is classified as a Class II unit designed with frontal opening for aspiration with 30% of the compete air involved. The Product Protection Sterility in active environment is higher that ISO Class 5 based on ISO EN 14644 (Class 100/M3.5 according to Federal Standard 209E) @ 0.3 and 0.5 ?m particles. Equal or less than 5 CFU per test. Performances Operator Protection The containment index has been accessed on the entire surface of the front working opening, this is less or equal to 5 CFU for non disturbance test of Apf or more than 1 X 105 based on EN12469. Minimum measure velocity 0,40 m/sec., and the remaining 70% reused by the HEPA filter located in the working chamber. The laminar flow velocity is between 0,25 and 0,5 m/sec (as defined by EN 12469 and DIN 12980).