Hello!

I was about to install fresh air vents but encountered a sheet of metal about 1mm thick behind the asbestos board, does anyone know what this is? It is above a window.

Thanks in advance!
 
  • Circular metal sheet behind wood panel above window, showing insulation.
  • A circular metal plate with a small hole is visible inside a duct, possibly behind an asbestos board, as described in the post about ventilation installation.
  • A round hole in a wall showing a thin metal sheet behind asfaboard, above a window, with a small central hole.
  • A metal sheet visible behind asbestos board above a window, with a wooden ceiling and brick wall in the background.
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