Revisions log for Answer #1523
This is the answer to the question What sliding glass door between the kitchen and living room to choose?
Revision 1
We decided against a sliding door going through the wall.
There may be some bias here, but we have decided against it for the following reasons:
1. if (for whatever reason) the door pops out of the rail or any other damage to the mechanism occurs, it can be difficult or too expensive to replace/repair (everything is inside the wall).
2) Even in a semi-closed system, contamination will occur at some point (whether it's the popular wool lint, which over time thickens into hard lumps, or through minimally abrasive metal shavings or perhaps "stone dust" from the wall). In my opinion, cleaning/removal here will be difficult (like you want to get behind a doorway with a vacuum cleaner). Sooner or later this could cause the treadmill to become dirty or, at worst, blocked.
It may turn out that these reasons are just prejudices and our philistine opinion is not true. It was important to us to minimize the risk of breakage/damage, so we opted for an exterior sliding door.