as ac fine test dust (acftd) and ac coarse test dust (acctd) (ac = air cleaner). its use is deprecated in favor of other standards like iso, ashrae etc. attrition degeneration caused by rubbing or friction. normally results in unwanted fine particles and slow material loss of the surface. average particle...
as ac fine test dust (acftd) and ac coarse test dust (acctd) (ac = air cleaner). its use is deprecated in favor of other standards like iso, ashrae etc. attrition degeneration caused by rubbing or friction. normally results in unwanted fine particles and slow material loss of the surface. average particle...
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