High Efficiency Mini-Pleats The mini-pleat style filter is available in 65%, 85%, 95% efficiency. The filter is available only in a variety of depths. A 95% 24x24x4 filter will typically have 127 sq. ft. of media and an initial resistance of 0.68" w.g. at 500 fpm. The filter is available in a beverage board, plastic or metal casing and with our without a header. The mini-pleat is an excellent replacement for bag or box filters offering comparable or more filter media in a much smaller space. The depth of the filter makes it easier to handle and install.