Assessment of the Effects of Ceiling-Mounted Destratification Fans on the Performance of 'Products of Combustion' Type Fire Detectors

摘要

The introduction of ceiling mounted destratification fans into rooms protected by 'products of combustion' type fire detectors will reduce the effectiveness of these detectors. This report documents the tests, test results and recommendations concerning the effects of ceiling mounted destratification fans on 'products of combustion' type fire detectors arising from the experiments and data analysis performed at the Naval Civil Engineering Laboratory under sponsorship of the U.S. Air Force Engineering and Services Center. The results of the tests performed show two distinct effects produced by the introduction of the destratification fans into the test facilities. Most clearly, the delay between the ignition of the fuel and the response of the detectors was increased by an average 16.2 seconds. As was to be expected, the detectors located closest to the smoke source were in general the first to signal alarm. (Author)