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Ultrasonic weld into pre-formed filter pocket, easily to assembled into your filters, low resistance and higher efficiency - details see: https://www.machineto.com/filter-media-for-ashrae-filter-meet-en179-2012-10219280

Material: pp Meltblown synthetic Media

Feature: low resistance, high dust-hold capability, high filtration efficiency, resistance to acid and alkali
Meeting American Ashaer standard
Filtration efficiency: 45%, 65%, 85%, 95%(Merv 9,11,13,14)

Code name: TD45B-II,TD65B-II,TD85B-II,TD95B-II
Especially suitable for environment of high humidity
Width:within 700mm, pre-fromed pocket by ultrosonic welding into pocket air filters, which are widely used for air cleaning in large shops, airports, schools and hospitals, with prefilter layer.