Separator for separating out particles of fatty substances from a gas current, more specifically from waste air from kitchens, and a waste air duct for the separator

A separator for removing fatty or oily particles from a current of waste gas, comprising:

• a frame having an inlet open end and an outlet open end, and a plurality of rods mounted in the frame substantially parallel to each other and over at least the full cross-section of the frame in rows extending normal to the longitudinal axis of the frame between said inlet end and said outlet end, each rod configured to define a trough facing opposite the inlet open end and spaced apart by a distance at most twice the breadth of an individual rod, wherein the rods of one row are staggered with respect to the rods of the adjacent rows and the spacing between diagonally adjacent rods is at least approximately equal to the spacing between the rods in each row and wherein each rod comprises means for controlling the flow of waste gas through the separator to effect the flow of waste gas into the trough thereof comprising at least one elongated hole extending along the longitudinal axis of the rods in a wall of the trough.