Final answer:
A standard shower pan drain is typically 2 inches in diameter, ensuring efficient water flow and adherence to plumbing requirements. Compatibility between the shower pan and drain is crucial for preventing leaks.
Step-by-step explanation:
The typical size for a shower pan drain is 2 inches in diameter. It is designed to handle the flow of water and prevent any backup in the shower. The drain connects to the home's plumbing system and ensures efficient water removal during and after a shower. When installing a shower pan, it's important to ensure compatibility between the pan and the drain size to prevent leaks and ensure proper drainage.