Section 1209.2 - Definitions and measurements(a) As used in this part 1209, Cellulose insulation means cellulosic fiber, loose fill, thermal insulation that is suitable for blowing or pouring applications.(b) The definitions given in section 3 of the Consumer Product Safety Act are applicable to this part 1209.(c) For the purposes of conformance with the technical requirements of this standard, the figures are given in the metric system of measurement. The inch-pound system approximations of these figures are provided in parentheses for convenience and information only. For numerical quantities for which no specific tolerances are given, the tolerance shall be one half of the unit value of the last significant digit given in the dimension. Where numerical quantities are given without tolerances in both the metric and inch-pound system of measurements, the tolerance shall be one half of the last significant digit of the metric equivalent of the numerical quantity.(d) The specifications and dimensions in the test methods below are given in metric units, with the English equivalents in parentheses. For enforcement purposes the Commission will use metric units.