NFPA 285 Exterior Wall Assemblies Fire Propagation Testing Apparatus
Scope:
This standard provides a test method for determining the fire propagation characteristics of exterior non-load-bearing wall assemblies and panels used as components of curain wall assemblies, constructed using combustilble materials or that incomorte combusibie components, that ae imended to be installed on buildings required to have exterior walls of noncombustible construction.
The fire propagation characteristics are determined for post-flashover fires of interior origin.
Standard:
NFPA 285 .
Test Apparatus:
1. The test apparatus shall consist of a two-story structure having a height of 15 ft 8 in. # 1 in. (4.8 m + 25 mm) with a test room on each story.
2. Each testroom shal have uninished inside dimensions of 10 f + 0.5 in. widex 10 ft + 0.5 in.deep(3.05 mt 13 mmx 3.05 mt 13 mm) wih an unfinishedfloor-to-ceiling height of 7 ft± 0.5 in.(2.13 m ±13 mm).
3. The test apparatus shall be constructed in accordance with Figure 4.2.3.
Burners:
1 The burner arrangement shall consist of two gas-fired burners
2 One bumer shall be placed inside the first-story test room, and the other bumer shallbe placed inside the first-slory window opening ofthe wall asembly
3 The test room bumer shall be constructed of nominal 2 in. (1 mm outside diameter steel ipe with nominal % in.(3 mm) diameter holes spaced a nominal lin.(25 mm) on center.
4 The burner holes shall be located along the top surface of the pipe.
5 The first hole shallbe located 3.5 f (1.06 m) from the rear wall on both sides of the gas suply pipes and continue across the front gas supply pipe
6 The gas supply pipe located within the test room shallbe wraped with a single layer of nominal 1 in.(25 mm) thick nominal 8 lb/t3 (128 kg'm') densityceramic fiber blanket.
7 The burner shall be positioned with its centerline 2.5 ft ± 1 in. (0.8 m ± 25 mm) above the floor.
8 Figure 4.4.8 shall be used to determine the design of the first-story test room burner.
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