86 Years in Business 1936-2022. Welcome to Glasfloss Industries, the oldest American owned and operated manufacturer of HVAC air filters. Owned and operated by the same family since 1936, Glasfloss is committed to producing the highest quality air filtration products for a variety of industrial, commercial and residential applications. From disposable panel filters to HEPA filters, Glasfloss is the Clear Choice for all of your air filtration needs. Five Plant locations across the Nation to serve your air filtration requirements. Contact Info - PH. 214 741 7056 Fax 800 435 8377 Email: orderentry@glasfloss.com