The table of Assigned Protection Factors (APF) in the March 16, 2007 issue (p. 8893) incorrectly lists the APF for pressure-demand or other positive-pressure mode supplied-air respirators as 50 for full facepiece and 1,000 for helmet/hood. It should be 50 for half mask and 1,000 for full facepiece. These APFs inadvertently shifted one column to the right.
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