The ornamental design for a filter for airpurification, as shown and described.
1. Filter for air purification
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Top
1.5 : Bottom
1.6 : Left
1.7 : Right
Materials: synthetic resin, metal and nonwoven fabric; the present design relates to a filter for an air cleaner which is used by removing a rotary blade in an electric fan and then inserting it into a motor shaft of an electric fan; the present design relates to a filter for an air purifier, which sucks contaminated air through vent holes provided on the front and back surfaces of the present design by using rotation force of the fan motor shaft and then discharges purified air after cleaning with a HEPA filter; the present design consists of a HEPA filter, an upper disc and a lower disc supporting the HEPA filter at upper and lower parts respectively, and a fan motor shaft fitting at the center.