If a drum full of sand landed on the duct while it was on a building, chances are it's gonna write off the rest of the roof regardless of wether the damper still works or not
+Machine Man This is to prove that damper will not be damaged in case of eg. part of roof or some support beam falling on top of the duct during fire so that it will continue to isolate rest of the building.
If a drum full of sand landed on the duct while it was on a building, chances are it's gonna write off the rest of the roof regardless of wether the damper still works or not
+Machine Man This is to prove that damper will not be damaged in case of eg. part of roof or some support beam falling on top of the duct during fire so that it will continue to isolate rest of the building.
mibars true that, didn't realise they were fire dampers as well, usually used to restrict the flow of air