As requested I carried out a sound test on my enclosure. I could’t get an accurate reading with a soundmeter app (reading was all over the place). Unfortunately the mic on my camera has adaptive levels which I couldn’t disable and so the mic adapts quickly so the change in sound as I open and close the doors is quickly levelled out. But it takes a moment to do so, therefore it gives you an idea of the sound difference at the moment when I open and close the doors!
The part when I close the doors in this recording is not and accurate representation as the mic has adapted to the louder sound so there is greater contrast when the doors are closed. The best representation is when the doors are opened at the start!