If you have an angled ceiling then you will require our
Gemini/Calgary door system.
In this instance, A is the measurement to the bottom of the
angle and D is the width of the opening from wall to the edge
of the angle. We will need both of these measurements plus
the MINIMUM of B and C and the MAXIMUM of E. These will
be the opening measurements.
Option 6 can be used in conjunction with Options 2,3,4 and 5