Ultrasonic weld into pre-formed filter pocket, easily to assembled into your filters, low resistance and ... name: TD45B-II,TD65B-II,TD85B-II,TD95B-IIEspecially suitable for environment of high humidityWidth:within 700mm, pre-fromed pocket by ... , which are widely used for air cleaning in large shops, airports, schools and hospitals, with prefilter layer. Filter Media for Ashrae Filter meet EN179-2012