Be sharp so

Secondly, you need to know if the hood will join external ventilation or not. It is better, of course, so that it connects to it, since in this case smells, hot air and fat are removed from the room. The diameter of the air duct should be larger or equal to the diameter of the connecting flange, and on the airbrush itself the bends should not be sharp so as not to prevent the extract of the hood.