Impact of suspended acoustical ceilings on the fire performance of open spaces.

An architectural design trend referred to as the “exposed structure” look is becoming increasingly popular due to a number of emerging design factors. In some cases, there is a desire to expose the overhead mechanical systems and roof deck, thus providing a feeling of spaciousness and economy. Or, in other cases, the desire for openness is driven by the installation of underfloor air distribution, in which case a traditional overhead ceiling is not needed to cover plenum mechanicals. The architects and building owners must, however, be reminded that the occupant safety, satisfaction, and performance will often be negatively impacted by these architectural design decisions. In particular, the response time of fire safety devices may be adversely affected, as shown by simulation tests.