IMPACT ECHO (IE)
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Table 1 – Styrofoam Defect Sizes
Defect ID
Circumferential
Lost (mm, in)
Depth Lost
(mm, in)
Circumferential
Permineter (%)
Lost in Depth
(%)
1 50.8, 2 6.35, 0.25 16 6
2 77.2, 3 13.6, 0.535 24 13
3 101.6, 4 23.4, 0.92 32 23
4 127, 5 34.8, 1.37 40 34
5 159.5, 6.28 50.8, 2 50 50
6 192.3, 7.57 66.8, 2.63 60 66
7 217.7, 8.57 78.2, 3.08 68 77
8 243.1, 9.57 87.9, 3.46 76 87
9 268.5, 10.57 95.2, 3.75 84 94
Figure 3 – Styrofoam supported by wire rod (left), the foam rod being inserted into the duct to form voids
(center) and view of Styrofoam defect inside a duct (right)
Figure 4a – Design Grout Defects (Styrofoam Voids) in the South Wall in 101.6 mm (4 inch) Metal Ducts
from top down
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