There are 3 solutions available: without a threshold, manual (with a threshold), concertinaed.
Sliding doors without a threshold attract the greatest attention due to their easy handling, wide passage, large glazing area, very good tightness, possibility of using them in large holes (up to 13,2 m wide), a 5 mm high threshold (!).
The construction enhanced with solutions developed at KARO, for example, double central sealing, a draining groove - all this, combined with meticulous workmanship and many years of experience (over 30 sliding doors a year) will satisfy every user, providing a real window to the world.
Among the advantages of the other solutions are... More at KARO.