Glazing greater than 9 square feet in area, located lower than 18 inches above the floor, must be protected with a horizontal member at least 1-1/2 inches high when placed between which heights?

The requirement for glazing greater than 9 square feet in area, located lower than 18 inches above the floor, to be protected by a horizontal member at least 1-1/2 inches high is crucial for ensuring safety in environments where people might be at risk of accidental contact with large glass panels.

The specified heights, in this case from 34 inches to 48 inches, are significant as they are within the range where individuals, including children or shorter adults, may come into contact with the glass. This protective measure is designed to prevent injuries that could occur if someone were to stumble or fall against the glass. By placing a horizontal member at this height, it serves as a physical barrier that reduces the likelihood of impact with the vulnerable areas of the glass.

This standard is typically informed by safety codes and building regulations that aim to minimize risk in public and private spaces, ensuring that large panes of glass do not pose a hazard in frequently accessed areas. Hence, the correct choice appropriately addresses the safety considerations related to glazing installations in specified locations.