Cleanability:
sharp folds increase the spacing between pleats making it easier to flush out loose debris.

Eliminates bridging:
allows particles to get down into the pleat instead of laying across the top of two or more pleats. This assures maximum dirt holding.

Full utilization of the pleat surface:
allows debris to build up from the inside out, critical to obtaining the maximum cycle life between cleanings.

Maximizes flow, minimizes pressure loss – by decreasing the surface contact between the inner pleat knuckle and center tube.