53 Pa. Stat. § 14938
No part of any room, in any building of the grades referred to in this act, shall be enclosed or subdivided, in whole or in part, by a fixed or movable partition, or other contrivance or device, unless such part of the room, so enclosed or subdivided, shall contain a separate window as herein required for ordinary rooms, and shall have a floor area of not less than seventy square feet: Provided, That rooms used solely for kitchens, kitchenettes, bath rooms, laundries, water closet compartments, shall be exempt from the provisions of this section with reference to floor area: Provided further, That all kitchens, kitchenettes, bath rooms, laundries, and water closet compartments shall be equipped for the purpose of which the room is planned.
53 P.S. § 14938