(1) Laboratory Centrifuge. International Equipment Company model B-22M. Floor Model Centrifuge. This large capacity 22,000 rpm centrifuge has programmable run capability, aerosol containment, and uses many rotors from earlier IEC B-20A centrifuges. Up to 22000 rpm/49300 xg/3 liters Ultrac Adapter Rotor Systems Large capacity bottles 250-500 ml: Conical tubes 15, 50, 175/225 ml Microtubes Filtration devices.