The Coldroom Door Sliding Track length is usually double the width of the door plus 180mm, this allows for the Top Track Stops located at either end which work in conjuction with the Bottom Door Stops.
Coldroom or Coolroom doors can become hard to open and close. This usually occurs because the nylon rollers that roll along the sliding track have become worn or damaged, or the bearing in the roller becomes worn and starts to seize. it is necessary to replace the the rollers and bearing before it does extensive damage to the sliding track.
It is also essential for the coldroom or coolroom door to have correctly fitted top and bottom door stops at either end of its travel. Incorrectly fitted or missing door stops will allow the door tilt when it hits one stop at either the top or bottom of the door. When a door tilts it causes impact to the top door rollers which will damage them over time.