34 Pa. Code § 45.126
Each circular ripsaw shall be guarded by an approved hood which shall cover the saw at all times at least to the depth of the teeth. This hood shall be attached to a spreader fastened at the rear of the saw. The hood, except for self-feed ripsaws, shall adjust itself automatically to the thickness of, and shall remain in contact with, the material being cut, unless finished surfaces of stock may be marred by contact with the guard, in which case the guard may be raised slightly to avoid contact. The hood shall be designed to protect the operator from flying splinters and broken saw teeth. The hood for self-fed ripsaws shall be supported from the machine frame but need not rest upon the table nor upon the material being cut. Hoods for self-feed ripsaws shall extend not more than 1/2 inch above a plane passing through the bottom of the feed rolls.
34 Pa. Code § 45.126
This section cited in 34 Pa. Code § 45.82 (relating to exceptions and special applications); and 34 Pa. Code § 45.146 (relating to hoods for woodworking machinery).