AAFD,
Welcome to the forum!
A lot of people have used foil in the BS.
I think what the manufacture frets over is that someone will use it example: wrap the drip tray with foil or cover the smoked product in such a way that the grease is redirected and runs down the door or worse, towards the heating element.
Oh well, if your Bradley ever catches on fire...at least you will know how to put it out!!
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<font size="2"><b>Doug</b></font id="size2">