Exposed fan drum??
 

Check out the picture of this Blenheim that is for sale at BCL
http://www.bristolcars.co.uk/usedcar...ilver-lrg3.jpg

Behind the a/c unit is that a centrifugal fan drum? I am just wondering why they don't bother putting a vent or some kind of mesh over this - I have noticed it on the other cars for sale. The H&S lobby would have a field day about chopped fingers or objects falling in when the fan was on!