Polyester filters (exhaust) can come in varying widths, weave patterns, and weight densities. Polyester filters (exhaust) resemble pillow stuffing. Polyester filters (exhaust) are often a good choice for spray to waste powder coaters and wood finishers. Polyester filters (exhaust) tend to appear robust to the eye when used in operations, however, they can plug up sooner than their paper & fiberglass paint booth filter (exhaust) counter-parts.