To fit correctly measure the width of the window plus 30/40cm (12-16), this will ensure your curtains will comfortably cover your window. Fit your track or pole approximately 15cm (6) above your window recess and centre ensuring you have 15-20cm (6-8) either side of the window.
A keg is a fancy version of your basic barrel. In the factory, a sheet of stainless steel is rolled into a cylinder and welded together. Then, at the cylinder's midpoint, a set of ribs is pressed into it for added rigidity. Next, top and bottom steel plates are stamped out and likewise welded into place.
The mini keg is a 5-liter keg produced for retail sales. Some brands come with a spout and pour from the bottom via gravity, while others may use a low cost pressurized tap. Mini kegs are typically not returned to the manufacturer for cleaning and refilling.