Filtration Filter Knowledge Menu - Activated Carbon, Air Fitlers, Bag Filters, Corrosion considerations, HEPA Filter design application and construction, High Temperature Filter, Liquid filtering, Membrane Filters, Stainless Steel Filters...

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Mini - Pleated Air Filter Design and Application - Mini - Pleated Air filter construction methods utilize 7/8 to 1 1/4-inch deep pleats with very narrow air spaces (1/8-inch) between, making it possible to pack more filter paper into the standard frame sizes than can be done with deep-pleat, corrugated separators, or even by using separator-less construction methods. Abutting folds are separated..

http://www.engineersedge.com/filtration/mini_pleat_hepa_filters.htm