Metal Pall Ring packing use of sheet metal by punching in the ring out of the wall with two rows of fenestrae with leaves. Fenestrae in each row there are five tongue leaves, each leaf tongue ring, point to ring heart, almost in the center up, the location of the upper and lower levels staggered fenestrae, the general opening of the ring a total area of about 35% of wall area around Pall Ring packing as a result of in-the-loop to open a lot of window walls, making the tower the gas and liquid can move freely through the window, the current Central fill Powell was used by one of the main ring packing.

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