What are the largest gate sizes available for our Zip Track gates? How do you determine if the gate is a left hand or right hand opening?

The largest size for our standard dual track Zip Track gate is 40′. Anything over the 40′opening would be constructed as a box frame gate which can exceed 70′. A gate is determined whether it is a left hand or right hand opening by the way the gate layout on the project is designed. If a gate slides to the right to open it is considered right handed if it slides to the left to open it is considered left handed.