// CODE SNIPPET

17.7.5.3* Purposes

National Fire Alarm and Signaling Code 2019 of Maine > 17 Initiating Devices > 17.7 Smoke-Sensing Fire Detectors > 17.7.5* Smoke Detectors for Control of Smoke Spread > 17.7.5.3* Purposes

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17.7.5.3.1

To prevent the recirculation of dangerous quantities of smoke, a detector approved for air duct use shall be installed on the supply side of air-handling systems as required by NFPA 90A and 17.7.5.4.2.1.

17.7.5.3.2

If smoke detectors are used to initiate selectively the operation of equipment to control smoke spread, the requirements of 17.7.5.4.2.2 shall apply.

17.7.5.3.3

If detectors are used to initiate the operation of smoke doors, the requirements of 17.7.5.6 shall apply.

17.7.5.3.4

If duct detectors are used to initiate the operation of smoke dampers within ducts, the requirements of 17.7.5.5 shall apply.

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