Capital Goods Pollution Control Equipment

Company Ticker 20212020201920182017201620152014201320122011201020092008200720062005
Donaldson Company Inc DCI 1.76021.461.771.561.521.761.641.731.431.050.841.060.920.780.64
Perma Pipe International Holdings Inc PPIH -0.41-0.440.38-0.391.35002.96-2.67-0.720.640.680.98-0.040.820.10.54
Fuel Tech Inc FTEK -0.02-0.17-0.3200.190.470.21-0.780.230.120.250.07-0.10.140.290.280.33
CECO Environmental Corp CECE 0.0400.5-0.210.360.980.990.50.320.650.510.15-1.060.30.450.24-0.04