Dwyer Instruments” Series DF pleated filters are a good fit for commercial, industrial and healthcare applications. Utilizing premium, synthetic material and an advanced design, the pleated filter is able to withstand considerable abuse from shipping and handling without damage. The thermally bonded synthetic material is not adversely affected by high humidity applications, as is typically the case in conventional cotton blend/resin-bonded pleat media. A square pleat tip design allows for both rigidity and increased surface contact. A center support strut adds strength and eliminates breaching. The frame is constructed of 100 percent recyclable moisture-resistant paperboard. The 100 percent synthetic media inhibits biological growth and allows for low-resistance operation.