1305.9.3.3 Fire-resistance rating.
MC § 1305.9.3.3
In addition to the outer containment enclosure, horizontal piping offsets shall be further enclosed in construction having a 2-hour fire-resistance rating. Exceptions: 1. A containment enclosure and 2-hour fire-resistance-rated enclosure are not required for the pipes serving the equipment or appliance within the room containing the pump, tank, or fuel-burning appliance where such room is itself enclosed with construction and materials having at least a 2-hour fire-resistance-rating.
2.A 2-hour fire-resistance-rated enclosure is not required for horizontal piping offsets located outside the building or on the roof.
