Quoted from Zitt:
But; isn't a cover of anything opaque going to protect the machine for long enough?
I do not think so, what the fabric is made of is important in that respect.
My pin is standing in front of a large window on the south side of the house. If I was putting an original AFM there I wouln't trust the covers from Andras to fully protect it from UV fading.
(I had an original AFM standing there with one side that was not faded. The AFM had no cover but the window curtains (thick fabric and opaque) were closed constantly. The yellow and red faded like you see on most AFMs in only one summer.