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Add some spacing to caps...
Over59,
Putting the foil on the end caps before putting them back in is a good idea that I will have to consider myself. It would be good, though, if you can space the foil away from the cap a bit. For best effectiveness the foil depends on an air gap on the side of the foil toward the source of the heat. For the summer time that is outside of the AS. For the winter, however, that will be toward the inside of the AS. That is why I am intending to have about 1/2" air gap on the inside and about 1" on the outside. You might very well be able to do this on the caps by glueing narrow strips of 1/2" thick foam to the caps and then glueing the foil to the strips. Just a thought...
Malcolm
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