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Double gates come with the same gaps as single gates, with hinges taking up a quarter of an inch of space. The difference is that double fence gates also have a center gap, which needs a little more clearance. Space the center gap at half an inch instead of the usual three-eighths of an inch for a single gate. 

The most common cause of gate sensors not working is damaged wiring. Only a professional should diagnose this because it requires working with the system's electronics. There are safety concerns, but more than that, you don't want to accidentally short out your system or cause any electrical damage. Insects, rodents, and fallen branches are common reasons your wiring could become damaged. 

Gates are often stuck halfway due to physical blockages or damage to the rollers, wheels, or tracks the gate runs on. Check to make sure there are no obstructions before considering that the motor might be burned out or malfunctioning somehow. Hopefully, the issue is simple, and you can remove it with a broom or your hands, but if your gate is stuck and there's no obvious reason why, you should call a pro to diagnose the issue.

Automatic gate openers last around 10 years, but this time span depends on several external factors, like the type of gate they're attached to and how well you’ve kept up with general maintenance. Despite lasting a decade, you should still expect to complete one or two repairs in that time, as some components will fail before others.