SINGAPORE - The collapse of the ventilation duct in a Nex mall cinema was due to "a significant amount of water" accumulating in the insulation material surrounding the duct. The investigation findings were released by the Building and Construction Authority in a statement on Monday (Dec 7), following the incident at a Shaw Theatres cinema hall on Aug 30 that left two moviegoers injured. The water accumulation was a result of "unforeseen excessive condensation over a sustained period", and its weight had overloaded the air-conditioning and mechanical ventilation (ACMV) dropper duct. This overloaded the brackets supporting the ACMV duct, causing it to give way. The acoustic material surrounding the duct typically serves to regulate the surface temperature around the duct to prevent water from forming due to condensation, and to insulate the noise caused by air travelling through the duct. Checks on other cinemas' ACMV systems and ducts had found no such excessive condensation, said BCA. A spokesman for Nex said in a statement on Monday that it will “continue to support and work closely with (its) tenant, Shaw Theatres, throughout the course of rectifications for the planned reopenin...