Refrigerant piping that crosses an open space that affords passageway in any building shall not be less than ______ above the floor unless the piping is located against the ceiling of such space.

• A. 7' 3"
• B. 7' 0"
• C. 6' 0"
• D. 8' 0"

Answer: (A)

Minimum headroom for refrigerant piping crossing an open passage is 7 feet 3 inches above the floor. This height provides safe clearance for people walking, carts, and other equipment, and it also allows room for maintenance work without the pipe posing an intrusion into the walkway. The note about being located against the ceiling gives an exception: if the piping is run along the ceiling, the floor clearance rule doesn’t apply in the same way because the pipe isn’t crossing the walking space at floor level. The other measured heights would not meet the required minimum and could reduce usable clearance or increase the risk of contact with the piping.