From TF2 Wiki
The Resupply Area is a room which is generally safe from opponents and provides you with supply closets to replenish your health and ammunition.
Depending on the map, this area may be adjacent to the respawn area, separate, or overlapping.
As a rule of thumb, control point maps are designed with the respawn and resupply overlapping, whereas many capture the flag maps use separate rooms. However, these options are entirely at the discretion of the map creator.
Most resupply areas contain one or more supply closets, which instantly provide full health, metal and ammunition upon opening. To open a supply closet, the player must simply walk near it. Note that resupply closets cannot be opened during sudden death.
The other benefit of a resupply area is as a safe refuge within your own base, as players from the other team may not enter it except during humiliation. But be careful: they can shoot through the doorway if it is open, although certain weapons such as the demoman's grenades will not pass through.
Other purely decorative objects within the resupply area may include lockers in which the various classes keep their personal belongings, lifting weights and targets for practice.
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