As he explained it to me, each of the two French door sides (top, bottom, left side, right side) has to seal tightly and there is much more opportunity for leakage at any one of those 8 points on repeated open/closes. Where as on the slider, there are only four sides to seal on the repeated open/close if the stationary portion is sealed effectively at time of installation.
Last edited by LuxLiving : 03-30-2008 at 07:49 PM.
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