PDFWAC 296-806-48068
Guard planers.
(1) You must make sure all cutting heads, and saws if used, are covered by a guard that:
(a) Is metal.
(b) Forms all or part of the exhaust hood if an exhaust system is used.
(2) You must make sure a guard constructed from:
(a) Sheet metal is at least one-sixteenth inch thick.
(b) Cast iron is at least three-sixteenths inch thick.