Profile: Class Biologically Clean Ltd. is involved in the protection of germ free isolators. Our range of products include flexible film clean rooms, canopies, doors, filters, sterilizing cylinders and all related accessories. Our germ free isolators are designed to provide complete control of air output. Our sterilizing cylinders are available in two standard sizes, 12" x 24" and 18" x 30", and are equipped with supply trays.