Patent ID: 8087167

Claim:
A method of fabricating emission control devices each of which comprises an outer housing with an insert clamped in place therein, the method comprising: a) deforming each insert inwardly by exerting a predefined pressure at its circumference, b) determining from the deforming step a wanted deformation of each insert needed to attain a wanted pressure, c) fitting the insert in an outer housing, the internal dimensions of which correspond to the outer dimensions of the insert as resulting from the wanted deformation, wherein a predefined deformation is produced with the insert by exerting an inwardly acting pressure and the wanted deformation is determined in that the pressure needed to attain the predefined deformation is measured on the insert, and wherein the predefined exerted pressure is lower than the wanted pressure and the wanted deformation is extrapolated from the pressure exerted at the predefined deformation.