T-hangar's bi-fold door: Convert to a motorized opening door?

Doordoc wrote:

So if your door is 10'
tall you do not need to change the reduction at all, but if your door
is taller then 10' you would have to change the reduction.

Since this is a folding door, it's not a matter of the door height at all. It's
purely a matter of how much of the chain on his door he needs to pull to raise it
versus how much chain the opener pulls before it hits its limit switch. If the limit
switch on the GDO is adjustable, there's no need for a reduction mechanism at all.

George Patterson
If you want to know God's opinion of money, just look at the people
he gives it to.