Patent ID: 7396374

Claim:
A grease filter for domestic extractor hoods, comprising at least two walls ( 2 , 3 ) placed face to face and having first through openings ( 4 ) made in them arranged in such a way as to cause sudden changes of direction in the fumes flowing through them, wherein at least one of these walls ( 2 , 3 ) includes a plurality of second openings ( 5 ) whose flow section is narrower than the flow section of the first openings ( 4 ), the first openings ( 4 ) and the second openings ( 5 ) combining to divide the total flow passing through the filter into two component flows which are in turn divided into a first plurality of macroscopic flows ( 6 ) following a labyrinth path through the first openings ( 4 ) and a second plurality of microscopic flows ( 7 ) passing through the second openings ( 5 ).