28/— | NU ar | Oo N (4-O1X 44) @UN|OA ANY 1 © ON 00 O | 2] | 4 | 5 { 6 Collection Time (Days) [ 3 { 7 Measured Flow Rates Average Total Air From Rated Flow- Rate Total Air Flow At Filter, NRL, Washington, D.C. Large Blower Due To Dust Loading Of Fig.2: Variation Of Total Air Flow With Time For a-Si lV 7s OOAN