Bottom Rolling Door Gear
Sometimes a top hung system cannot be used, as the weight of the door cannot be supported from above; in this case a bottom rolling system is recommended
A bottom rolling system consists of two rollers at the bottom of the door running on a track and two guides at the top running in a guide channel. As all the weight of the door is concentrated on the two bottom wheels, more force is needed to move the door than on a top hung system.; (cite a reference for this assertion)
Read more about this topic: Sliding Door
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