Three- Stage Air Purifier with Pre Air Filter is designed with activated carbon filter by which cloth traps the minute particles, which carry micro organism with them. The Air Purifier is designed with pre air filter which is mounted at the inlet side of a filtering cloth of 5microns. The Air Purifier is available with ozone chamber, in this chamber air will get lonized due to negative ions and disinfected and deodorize due to oxidation property of ozone. Three- Stage Air Purifier with Pre Air Filter is strong and rigid in construction and requires minimal maintenance.