Ceiling Surfaces, Girder
Ceiling Surfaces, Girder : A support for beams or joists that runs at right angles to the beams or joists. If the top of the girder is within 100 mm (4 in). of the ceiling, the girder is a factor in determining the number of detectors and is to be considered a beam. If the top of the girder is more than 100 mm (4 in). from the ceiling, the girder is not a factor in detector location
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