Final answer:
The standard height for stair handrails is generally 34 to 38 inches, but local building codes should be consulted for exact requirements.
Step-by-step explanation:
The question regarding the height of stair rail systems does not provide sufficient context to give a precise answer as building codes and safety standards can vary by location and the specifics of the stair design. However, in many regions, for residential and commercial buildings, the standard height for stair handrails is typically between 34 and 38 inches (86 to 97 cm) measured vertically from the nose of the stair tread to the top of the rail. It is essential to refer to the local building codes and standards for the exact requirements as they may have specific regulations for rail heights in different environments or types of construction.