All concrete will retain an element of moisture within its mass after the construction process, and it is important that once the roof is waterproofed, there is not risk of this retained moisture does not bulge out of the top of the structure and cause the waterproof seal to bubble, blister or even burst. The vent is designed to draw this moisture away from the concrete slab.
http://www.wallbarn.com/products/roof-outlets-vents/roof-vents-aerators/
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