Tornado particle filters require the use of only 1 filter.
PF251/2 PSL - Solid and liquid particulates (dusts, fibres, mists, fumes, bacteria and virus)
PF251/SUPER PSL - As above with approximately three times the capacity
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.