I decided to open up the backend that came with the B-40. Very interesting solution to the heater but WTF is that - something from a old stove oven or perhaps space heater???
While I get that the PO did what they needed to, just a shame the back cap is gone. Heck, remaking the heaters in these Empires isn't all that hard - if you have all the original bits that is. Oh well...