Smoke detector above the red hood have what use

Recently, the Chongqing City Fire Department found a funny situation during a routine check on a hotel: the hotel installed smoke detector with a red cover, very out of the ordinary. Asking the hotel person in charge after that, the smoke detector is their newly purchased, installed a few days, after assembly is like this, who has not had. Then the smoke of the red hood detector above what is what to do with it?

This is the original smoke detector in the factory, the factory installed protective cover. Probe smoke detector is very sensitive, vulnerable to the impact of dust and other solid particles, in order to ensure that during storage, transport and installation is not to absorb dust and affect the performance of a smoke detector, so the design of such a red shield. The cover also has a role, when you detector near the construction decoration in the smoke, can be used to cover the detector cover, to prevent the renovation generated dust and sawdust floated into the smoke detector smoke inside the maze.

Fire officers and soldiers after the explanation, the responsible person see light suddenly. The installation of smoke detector is good, but first you have to have some basic knowledge of the products, so as to avoid a joke.