You will need to purchase a NEW main downflow HEPA filter which was removed by the previous owner.
Heto Holten S2010 1.5BE Biological Safety Cabinet
£0.00Price
Thermo Heto Holten S2010 1.5BE 10N.K Biological Safety Cabinet YOM 2004, 1.5M wide, single HEPA exhaust filter, microprocessor control with easy to read LED display, airflow velocity indicator, combined sliding and hinged glass screen, glass side walls for better light on work area, sloping front, UV light, internal light 1200Lux, integral stand, ext dims 1320H x 1640W x 895D, int dims 725H x 1500W x 580D mm.