Fiberglass media is designed with strands of fiberglass fibers bonded together for strength in an open pattern on the air entry side and is tightly woven on the air exit side.  This dual stage design allows progressive loading on the air entry side and the dense air exit side allows particle retention within the filter.  This fiberglass is commonly used on the exhaust side of paint booths.  300 lineal foot rolls, standard widths and precut pads are available.