1. (the layout)Should be placed in many different positions along the canal system and the way how the details. But they especially need is in the position to be filled out in the end. Usually it is those areas far from the entrance most plastics. Because when this last area, then fill the air being compressed and formed the gas trap should it be arranged here. 2. NoteLayout of gas drainage trench in places easy to create defects because the air doesn't escape, such as: fire, gas holes, ... In addition, a solution which is the Canal shape machining white-eyes, the air will follow the air holes around the exit.
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