Prev air filter has paper element only.New one from Mann has a piece of foam gauze flat material stuck to the paper element.It seems like part of it.Is it correct?or is it some package material accidentally stuck there.

Thanks.Sunday.12 oct
Tom

The "foam" layer is part of the Mann Air Filter. No reason to remove it and if you try you will likely ruin the filter. It is on the "dirty" (inlet) side of the filter so there is no way it could ever come loose and go downstream.
The foam mentioned in previous posts that people have removed is the lining material inside the cleaner box. I removed mine shortly before I sold my 744 because it was starting to disintegrate and fall off in chunks. My 945 does not seem to have this lining material in the air cleaner box, so maybe Volvo figured out it was not necessary and changed the design at some point.
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Current: '95 945, 95k miles; '90 BMW 325i, 90k miles. Former Volvos, gone but not forgotten '85 245, 250k miles; '91 744T, 150k miles

I read something posted on this site that a chap totally removed this foam stuff that you are talking about. Reason being it was coming loose and clogging up his air mass meter. The air cleaners that I seem to use have a formed edge.