Final answer:
Chain-link fences must be constructed with 9-gauge or heavier wire, be zinc coated, and have a mesh opening not larger than 2 inches per side. The fence must stand a minimum of 6 feet tall, not including the top guard.
Step-by-step explanation:
The construction of chain-link fences requires certain specifications to ensure durability and safety. The wire used must be of a specified gauge, or thickness, to provide adequate strength. The gauge must be 9-gauge or heavier, which means the diameter of the wire must be sufficient to withstand certain stresses. The zinc coating on the wire helps to prevent rust and corrosion, extending the life of the fence. The mesh opening refers to the size of the gaps in the chain-link fence; these must not be larger than 2 inches per side to prevent objects or animals from passing through the fence easily. The minimum height of the fence, not including any additional features such as a top guard, must be 6 feet. These regulations are often set by local building codes or by specific requirements of institutions that are implementing the fence.