date:Sep 25, 2013
ld be matched with each AHU. In the high contaminant area, the quickly overwhelmed prefilters the company had been using were replaced with Camfils 22-inch deep Hi-Flo MERV 9 bags. Meanwhile, Camfil 30/30 2 deep MERV 8 pleated filters were installed in the AHUs second stage, and MERV 13 Camfil Hi-Flo ES filters in the final stage.
In use, the MERV 9 prefilters lasted six times longer than the previous air filters, while the MERV 8 and MERV 13 filters lasted twice as long as the filters they rep