Product review (4 stars): Wasn't as thick as the original one but it made things a lot better just the same and cost way better than the ...
Fit right in place, seemed to be less restrictive - the fan ran smoother and quieter.  Wasn't as thick as the original one but it made things a lot better just the same and cost way better than the suggested "get a whole new exhaust unit the local nitwitted "big box" sales people said was the only thing to do fro "such and old" design as my thing (Nautilus stove hood exhaust).