Spaces, Concealed
Spaces, Concealed :
That portion(s) of a building behind walls, over suspended ceilings, in pipe chases, attics, and whose size might normally range from 44. 45 mm (1 3/4 in). stud spaces to 2. 44 m (8 ft) interstitial truss spaces and that might contain combustible materials such as building structural members, thermal and/or electrical insulation, and ducting
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