Hanging a quilt is most commonly done by attaching a quilt sleeve. A quilt sleeve will ensure that your quilt is well supported, particularly if the quilt is large, and will also ensure that no damage is done to the quilt by attaching clips in order to hang it.
Art quilts, though, are sometimes irregular shapes, so attaching a standard type of quilt sleeve will not always be practical. You will need to determine what is the best way to do this and you may need to be a little creative with the way you attach your sleeve.
The size for a quilt sleeve, by quilt show standards, is usually 4", so it is good practice to use this size when attaching quilt sleeves to any of your quilts.
Today you may not want to show your quilts, but tomorrow may be a different story, and if your quilt sleeve is too small you will have to remove it and attach a new one. It’s just good practice to get into the habit of always attaching a 4" quilt sleeve.
Quilt sleeves are generally indented approximately 1" on either side so that when the quilt hangs, you do not see the hanging rod.
However, sometimes the hanging rod can be considered a decorative feature and can actually add interest to your quilt, particularly if the rod has decorative finials.

Specialty quilt hangers are another option. They can be readily found these days in stores or online and some are made using specialty woods which can add an extra element of warmth to your quilt.
Since fabric fades over time, whatever you can to to slow the process is going to be beneficial. The best way to prevent fading of course, is to always hang your quilt away from direct sunlight.
There is also a product called Quiltgard which is a UV spray designed specifically for quilts and is available from Craftgard.
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