Perforated sheet metal forms offer a few key advantages over wire mesh,
such as not needing as much welding, higher structural integrity, and
the ability to leave some surfaces without holes to prevent spillage of
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The
holes in a perforated sheet metal form are also known as the open area
of that form. The open area of a piece of sheet metal allows for the
passage of air, light, liquids, or solids through them. Open area is
most desirable for applications that require free flow of fluids, heat
dissipation, pressure drops, acoustic absorption, and reduced weight.
These
are just three of the more common shapes out of the many that are
possible. This makes the task of listing all of the different
combinations of shapes and patterns all but impossible.

However,
the Industrial Perforators Association (IPA) has listed some general
guidelines for the limitations for open area in perforated sheet metal
forms among the three common shapes mentioned above.Round holes are the
most common shape in the perforated sheet metal industry. There are a
few reasons for this.

First, these shapes can be punched into
sheet metal with the greatest efficiency using CNC punches.Second, round
holes have the lowest cost for punching of all the custom shapes out
there.

Third, the tooling for round hole punches is amongst the most durable of all the shapes out there.

Finally,
the round perforation is one of the most versatile of the perforation
patterns available, able to be arranged in staggered or straight
configurations with ease for maximum or minimum open space.