The perimeter frame of the perfect pleat HC is constructed from high wet strength beverage carrier board. Three strong support straps are glued perpendicular to the pleats in order to maintain the pleat spacing and add rigidity to the media pack. Perfect pleat HC filters are designed for industrial and commercial applications having light to medium dust loading conditions. They provide significantly higher efficiency than disposable panel filters, permanent filters or media pads in metal frames. The 1 perfect pleat HC M8 is recommended for applications where a more durable, moisture resistant filter is needed than typical pleated filters.