AIR FILTERING

摘要

A method of forming a vapor-absorptive air filter comprising a non-woven carrier material and adsorbent particles wherein heating and calendering of the carrier material distributes adsorbent particles through a substantial depth. The chemical air filter (14) can be employed directly upstream of a clean room HEPA filter (24) in an air handling system (12, 22). The chemical filter includes a matrix formed of a large multiplicity of synthetic fibers and activated carbon is distributed throughout the web, bound in the interstices of the matrix, preventing loss to the air of particles in quantity substantially detrimental to the performance of the HEPA filter. The activated carbon being selected to remove a predetermined gas-phase contaminant from the air source. A non-off gassing filter casing may easily be installed into existing clean air handling systems.