Is this how the cooling holes in the power distribution cabinet are made? Or drive out?

Generally, it is outward, protruding from the inside of the cabinet (that is, protruding outside the cabinet). Now there is this method in the sheet metal factory of the whole cabinet, but it is becoming less and less. General manufacturers find it troublesome to directly open a square hole to install a plastic intake filter cover, or directly make a round hole in the waist and then weld a metal mesh inside, which is also relatively simple.