Man sized opening according to UL is defined as which of the following?

• A. 96 square inches and the smaller dimension greater than 6 inches
• B. 100 square inches and the smaller dimension greater than 5 inches
• C. 64 square inches and the larger dimension greater than 8 inches
• D. 90 square inches and any dimension greater than 5 inches

Answer: (C)

UL defines a man-sized opening by combining both area and a minimum on one dimension. Specifically, the opening must have an area of 64 square inches and the longer of its two sides must be greater than 8 inches. This ensures enough space for a person to reach through or maneuver while also requiring a dimension long enough to be practical for access. If the area is 64 square inches but the longer side isn’t over 8 inches, it wouldn’t meet the standard. If the area is different or the longer side criterion isn’t met, it wouldn’t satisfy UL’s requirement either. So the combination of 64 square inches with the larger dimension exceeding 8 inches is the correct definition.