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[...] the monitoring and additional supervision requirements of the fire alarm and automatic sprinkler systems mandated by some insurers could surprise designers and installers, who must take care when determining the extent of the fire alarm system design and its operation. NFPA 9OA requires duct smoke detectors downstream of the air filters and ahead of any branch connections in air supply systems with a capacity greater than 2,000 cubic feet (57 cubic meters) per minute in and at each story before the connection to a common return, and before any recirculation or fresh air inlet connection in air return systems with a capacity greater than 1 5,000 cubic feet 425 cubic meters per minute and serving more than one story.
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"Industrial Considerations"Please download to view full document