Exhaust fans are generally in a relatively high position, now remove may not be realistic, but also very troublesome, if possible, in the exhaust outside the mouth to change a pipeline, the air out of the place to transfer to other places. Is your building tall? In my case, I used a very high iron pipe, and it was connected to the top of the building, facing the sky directly. I can get a large floor fan. The kind of tube with the same effect is particularly good, but also save space

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