Figure 8.
Panel a shows a pathway extending downward from a point near R 2 towards C 1. The accompanying plot marks a single point at about 180 degrees and about 175 centimetres height. Panel b shows a pathway extending downward from R 2 towards C 1 with a lateral branch. The accompanying plot gives values at 0, 90, 180, 270, and 360 degrees, with heights near 180 centimetres to 210 centimetres, and a decrease to about 20 centimetres at 270 degrees. Panel c shows a pathway extending downward from R 2 towards C 1. The accompanying plot marks a single point at about 180 degrees and about 175 centimetres height. Panel d shows a pathway extending downward from R 2 towards C 1 with a short lateral branch. The accompanying plot gives values at 0, 90, 180, 270, and 360 degrees, with heights near 180 centimetres to 210 centimetres, and a decrease to about 100 centimetres at 180 degrees.Schematic diagram of the direction of gas flow during gas testing in lower canister filter FL903: (a) Gas Test 1; (b) Gas Test 2; (c) Gas Test 4; (d) Gas Test 6