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.
A sixtel keg is 1/6 of a full keg of beer. Sixtels are also called sixths due to their size. A sixtel keg is similar to a corny (cornelius) keg in size, however it will have a commercial style connection (rather than ball/pin lock fittings). A sixtel keg is equivalent to .16 barrels, and holds approximately 5.16 gallons. Sixtel kegs are commonly used by craft breweries and those serving high gravity beers.