VoidAlert™, on the other hand, offers continuous detection down the entire length of the cable and can provide a very cost-effective means of achieving detection. ” Note 11 states: “Within horizontal voids, beams or obstructions that are deeper than 10% of the overall depth of the void regardless of whether the void is above the ceiling or below the floor, ought to be treated as walls that subdivide the void.”Ĭeiling voids typically contain structural members supporting the floor or roof above and the depth of these structures is typically more than 10% of the height of the void, effectively creating multiple “cells” which require individual protection.Ĭovering these cells with point detectors can very often prove to require more detectors than covering the rooms beneath the void. One form of automatic fire detection is heat detection and VoidAlert™ is a line type heat detection system.īS5839-1:2017 paragraph 22.3k) further states: “Ceiling obstructions, such as structural beams, deeper than 10% of the overall ceiling height should be treated as walls. Note that this clause of the standard refers to “automatic fire detection” not smoke detection. Voids within the parameters given that are above or below any areas that are required to be protected should also be protected regardless of the final system category. This paragraph does not bear reference to the System category (e.g., L1, L2 etc). BS5839-1:2017 states at paragraph 22.2d) “If the system Category is such that automatic fire detection should be provided in any area that contains a horizontal void of 800 mm or more in height, automatic fire detection should also be provided in the void.”
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