In retail contexts, specifically for industrial covers, "4-39" often refers to a custom or specific square footage dimension.

He walked to the service ladder bolted to the interior of the elevator shaft wall. It was dangerous, the rungs slick with rain, but Thorne was desperate. He climbed down.

Is 9 feet still considered the max draft for a looper vessel? - Facebook

Thorne stepped out of his car, his boots splashing in a pothole. The Skyler Tower loomed above him, a gray skeleton of steel and concrete against the gunmetal sky. This was the fourth death this month. The press was calling it the "Architect’s Curse." Thorne just called it a headache.

16.4 feet (often rounded or listed as 4.39 meters in some contexts)

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