ventilation

It can take thousands of workers to build a plant, with large amounts of steel and concrete and several systems for cooling, ventilation and controls needed.

But poor ventilation can also be caused by structural problems like roof leaks or poor drainage, she says - and landlords have a responsibility to address these root causes.

A small percentage of installations - 6% for external and 2% of internal insulation - posed an "immediate health and safety risk" from faults such as exposed live electrical cabling or blocked boiler ventilation, it said.

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.