R 408.41863 Inside storage.

Rule 1863. (1) Not more than 25 gallons of flammable liquid shall be stored within a room outside of an approved wood or metal cabinet. For storage of liquefied petroleum gas, see R 408.41877. (2) Not more than 60 gallons of category 1, 2, and/or 3 flammable liquids or 120 gallons of category 4 flammable liquids shall be stored in any 1 storage cabinet. Not more than 3 such cabinets shall be located in a single storage area. Quantities in excess of this shall be stored in an inside storage room as prescribed in R 408.41864 (3) A wood cabinet, when used to store flammable liquids, shall have the bottom, back, sides, and top constructed of not less than 1-inch exterior plywood which shall not break down or delaminate under fire test conditions. All joints shall be rabbeted and secured in 2 directions by flathead wood screws. When more than 1 door is provided, there shall be a rabbeted overlap of not less than 1 inch. Steel hinges shall be mounted so that the holding capacity is not lost due to loosening or burnout of the screws. The cabinet shall be painted inside and out with a fire-retardant paint. (4) A cabinet used to store flammable liquids shall be labeled with conspicuous lettering, "Flammable Keep Away from Open Flames" as prescribed in the Construction Safety Standard Part 22 “Signals, Signs, Tags and Barricades,” as referenced in R 408.41802. (5) A flammable liquid shall not be stored in a building in an area used as a means of egress.