task ventilation exposure frequency
insulation general low 3
insulation general near_legal 3
insulation general above_legal 22
insulation neg_pressure low 10
insulation neg_pressure near_legal 1
insulation neg_pressure above_legal 7
tile general low 3
tile general near_legal 1
tile general above_legal 2
tile neg_pressure low 29
tile neg_pressure near_legal 1
tile neg_pressure above_legal 1