NFPA 285-2019 Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Wall Assemblies Containing Combustible Components.
I 4.2.3 Materials shall be considered limited-combustible mate- rials where tested in accordance with ASTM E2965，Standard T est Method for Detrmination of Low Levels of Heat Release Rate Materials and Products Using an Oxygen Combustion Calorimeter, an incident heat flux of 75 kW/m2 for a 20-minute exposure, and both the following conditions are met: (1) The peak heat release rate shall not exceed 150 kW/m2 for longer than 10 seconds. (2) The total heat released shall not exceed 8 MJ/m2. [5000:7.1.4.2.3] 4.3 Test Facility. 4.3.1 The test apparatus described in Section 4.4 shall be loca- ted inside a test facility. 4.3.2 The test facility shall have minimum dimensions of 30 ft wide x 30 ft deep x 23 ft high (9.1 mx9.1 mx 7.0 m). 4.3.3 The test facility shall have provisions for supplying combustion makeup air taken from the outside during the test 4.3.4 The test facllity shall be constructed to allow for the exhaust of the combustion by-products during the test while not inducing an airflow on the exterior face of the test speci- men. 4.3.5 The test facility shall protect the test apparatus and test specimen from exposure to wind and precipitation. 4.4 Test Apparatus. 4.4.1 The test apparatus shall consist of a two-story structure having a height of 15 ft8in.士1 in. (4.8 m土25 mm) with a test room on each story. 4.4.2 Each test room shall have unfinished inside dimensions of10ft士0.5in.widex10ft士0.5in.deep(3.05m土13mmx 3.05 m土13 mm) with an unfinished floor-to-ceiling height of 7ft土0.5in. (2.13 m土13 mm).
4.4.3* The test apparatus shall be constructed in accordance with Figure 4.4.3. 4.4.4 The slabs shall be constructed of reinforced concrete. 4.4.5 The upper two slabs shall be supported by steel columns designed to support the loads, and the columns shall not be located inside the test rooms. 4.4.6 The thickness of the concrete slabs shall be as fllows: (1) The first-story slab shall be not less than 6 in. (152 mm) thick. (2) The second-story slab shall be 8 in.土0.5 in. (203 mm 土13 mm) thick. (3) The top slab shall be not less than 6 in. (152 mm) thick. 4.4.7 The three permanent walls (one rear wall and two side walls) that form each test room shall be constructed of nominal 8 in. (203 mm) concrete block or equivalent construction. 4.4.8 The interior surfaces of the first- story test room shall be protected as follows: (1) The walls and ceiling shall be covered with one layer of nominal % in. (16 mm) thick Type X gypsum wallboard conforming to ASTM C1396/C1396M， Specification for Gypsum Board, and one layer of nominal 1.5 in. (38 mm) thick nominal 8 Ib/t3 (128 kg/m3) density ceramic fiber insulation on the interior face.NFPA 285 pdf download.