Glass filter paper with a pore diameter of 20µm and diameter of 25mm.
Fiber filters consist of a fibrous mat and don't have a pore size. Nuclepore polycarbonate filters are the only ones that have a consistent pore size, though some membrane filters site a "pore size" based on some penetration efficiency of different particle diameters. Nuclepore filters in the stacked filter unit are used as a size-selective inlet. A 10 um pore size gives a 50% cut-point of ~2 microns with a broad sampling effectiveness curve.
See the following reviews and references cited therein for more information on filter types, sampling efficiencies, sampling effectiveness, and undesirable characteristics (e.g. gas absorption, trace contaminants, flow resistance, friability) for sampling and passing atmospheric particulate matter.
Chow, J.C. (1995). Critical review: Measurement methods to determine compliance with ambient air quality standards for suspended particles. J. Air Waste Manage. Assoc., 45(5):320-382. http://www.tandfonline.com/doi/pdf/10.1080/10473289.1995.10467369.
Watson, J.G.; Chow, J.C. (2011). Ambient aerosol sampling. In Aerosol Measurement: Principles, Techniques and Applications, Third Edition, 3; Kulkarni, P., Baron, P. A., Willeke, K., Eds.; John Wiley & Sons, Inc.: Hoboken, NJ, USA, 591-614.
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