This 16 x 25 x 1 disposable fiberglass filter is manufactured with high quality components. The frame is thermally bonded to the media and facing and it is constructed of continuous non respirable strands. The glass fibers are encapsulated in a polyester coating to maximize particulate retention. Designed for use in residential, retail, commercial and industrial applications. Certified: UL 900 Class 2. Safe and efficient, these filters are available in standard and custom sizes.