The tension shows how tightly the chain of the garage door opener is set. Each more comes with a specific requirement presented in the owner’s manual. If the tension is greater than required, the hardware parts will get worn more quickly. If the chain is somewhat loose, it may get disconnected from the sprocket and even fall down.
There is a definite life span for your garage door springs. We suggest checking it very frequently. If something is wrong, you have to replace it immediately. You should purchase a replacement that is suitable to your door, in order to avoid future problems.
When using a steel garage door, rusting after some time is normal. It is steel and it reacts with the environmental changes. To solve the problem, you can get a hold of anti rust agents which won’t affect door quality.