A-3.4.3.4. Clear Height and Width.

 A-3.4.3.4. Clear Height and Width. 

Clear height is intended to be measured from a line tangent to the nosings extended to the underside of the lowest element above the walking surface, over the clear width of the exit (see Figure A-3.4.3.4.). Examples of low elements above the walking surface include light fixtures or sprinkler heads and piping.

Clear width is intended to be measured from a line tangent to horizontal protrusions such as handrails.

Quoted from NBC2020

#clearheight #clearwidth #buildingcode #sprinklerheads #lightfixture #handrail

This article is important

3.2.3.13.2) If an unenclosed exterior exit #stair or ramp could be exposed to fire from an opening in the exterior wall of the building it serves, the opening in the exterior #wall of the building shall be protected in conformance with the requirements of Sentence (4) where the opening in the exterior wall of the building is within 3m horizontally and

a) less than 10m below the exit stair or ramp, or

b) less than 5m above the exit stair or ramp.

#exteriorexitstair #exteriorwall #exitstair #exitramp #buildingcode