Measure the Inside of the sleeve (Length ,width & depth) and the same measurements of the Outside of the A/C unit to be sure it will fit the sleeve.
12' To answer this properly more information is needed about the cone. 12' is just one measure, a cone is a 3 dimensional figure.
The measure of the amount of space a solid figure is Volume
The measure of the amount of space a solid figure is Volume
figure of condensor
You measure it.
demensions
It is helpful to measure air pressure and allows you, if you can figure out how to use it properly, then allows you to figure out if a storm is coming. So it would be very helpful to people who predict the weather, weather forecasters. I am sure there are other reasons however I am not sure what they are yet.
Significant figure
70
Geometry
That's the 'volume' of the figure.
it measure the length of time and space of a figure