55 Pa. Code § 41.12 – Form.

(a) Printed documents may not be less than 12-point font.
(b) An original hard copy of a pleading bearing an original signature must be filed with the Bureau by personal delivery or first-class mail.
(c) A legal document may be filed with the Bureau in hard copy by first-class mail or personal delivery.
(d) A legal document may be filed by facsimile if the document does not exceed 20 pages in length, including attachments and exhibits. An executed hard copy of a document filed by facsimile shall be maintained by the filing party and produced at the request of the Bureau or other party.
(e) Subsection (a) supersedes 1 Pa. Code § 33.2(b) (relating to form) as it relates to font size of printed documents.

This section cited in 55 Pa. Code § 41.92 (relating to expedited disposition procedure for certain appeals).