ventilation

In June, he completed a heating, ventilation and air conditioning certificate from a vocational school.

Residents say the noxious riot control gases released by federal agents travels through the building's ventilation.

He told BBC News it was understood there was not enough ventilation around the generator while it was being used.

The agency said it suspects the cause was poor maintenance and inadequate ventilation in the inverter battery area, which caused overheating and combustion.

Ms Rösler, perhaps anticipating the WHO's call for adaptation, called for school buildings, many of which are due for renovation, to include new ventilation systems, and even air conditioning.