Question

For beams and joists exceeding 10% of the ceiling height and beam spacing is equal to or greater than 40% of the ceiling height (0.4H), spot type detectors must be located ______.

Answer 1

Spot type detectors should be placed within the recessed spaces of beams and joists when these exceed 10% of the ceiling height and with spacing equal to or greater than 40% of the ceiling height, typically not greater than 0.4 times the ceiling height.

Step-by-step explanation:

The guidelines for the placement of spot type detectors in scenarios where beams and joists exceed 10% of the ceiling height, and beam spacing is equal to or greater than 40% of the ceiling height (0.4H), come from fire protection engineering standards. These standards stipulate that spot type detectors must be placed within the recessed spaces formed by these architectural features to ensure effective fire detection coverage. In the case where detectors must be located within beams and joists exceeding the given percentages, they are typically placed at a spacing not greater than (0.4 times the ceiling height) in order to ensure that smoke can effectively reach the detectors in the event of a fire.