Window Height From Floor Tempered Glass

Why is tempered window glass necessary.
Window height from floor tempered glass. Grade a roof walking surfaces or other horizontal within 45 degrees 0 79 rad of horizontal surface adjacent. The size of the glass exceeds 9 square feet. The glass is within 36 inches of where people walk. If you are installing windows within 2 feet of a door and lower than 5 feet from the ground you need tempered glass in the windows even though these might be higher than 18 inches from the ground.
Outboard panes in insulating glass units and other multiple glazed panels where the bottom edge of the glass is 25 feet 7620 mm or more above. Don t worry our glass experts will make sure your windows are up to code. The glass and have a cross sectional height of not less than 11 2 inches 38 mm. Windows fixed or operable windows must include safety glass if they measure larger than 9 feet square the bottom edge is less than 18 inches above the floor the top edge is more than 36 inches.
I heard that the minimum window sill height above a floor is now 24 when the window is 6 off the ground to prevent accidental falls. Any windows in a door must have tempered glass no matter the height unless it is too small for a 3 inch ball to pass through the window.