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Because not only will you get a greater amount of contact with the floor itself but you will have the anti squeak rubber feature as well which serves to substantially deaden the sound of the unit operating and coming back up into its housing when the doors opened.
We can also help you with the balance of the hardware that you would need for such a door such as heavy hinges or pivots and locksets as well so please reach out to us with your hardware set and we will review.