55 Pa. Code § 3800.131 – Fire extinguishers.

(a) There shall be at least one operable fire extinguisher with a minimum 2-A rating for each floor, including the basement and attic.
(b) If the indoor floor area on a floor including the basement or attic is more than 3,000 square feet, there shall be an additional fire extinguisher with a minimum 2-A rating for each additional 3,000 square feet of indoor floor space.
(c) A fire extinguisher with a minimum 2A-10BC rating shall be located in each kitchen. The kitchen extinguisher meets the requirements for one floor as required in subsection (a).
(d) Fire extinguishers shall be listed by Underwriters Laboratories or approved by Factory Mutual Systems.
(e) Fire extinguishers shall be accessible to staff persons. Fire extinguishers may be kept locked if access to the extinguisher by a child may cause a safety risk to the child. If fire extinguishers are kept locked, each staff person shall be able to immediately unlock the fire extinguisher in the event of a fire emergency.
(f) Fire extinguishers shall be inspected and approved annually by a fire safety expert. The date of the inspection shall be on the extinguisher.

This section cited in 55 Pa. Code § 3800.302 (relating to exceptions for outdoor and mobile programs).