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The way the sturcture is....
Looking at a blue print in front of me, it is 20" to the top of the upper bar, then you take away 1.25" for the upper pipe, then you have a section with vertical supports down to 16" off the ground which is to the upper portion of the lower bar. The lower bar is also has an OD 1.25" so the total passable height is just less than 14.75"
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