But the space still has real value. See, the Dickenson heater makes a *lot* of heat. Left to itself, all that heat just rises straight up and cooks the overhead - not good at all. So I purchased a 12V automotive radiator fan and mounted it in the plenum, just behind the air register above and behind the heater. This fan serves two purposes:
- It moves the heat away from above the Dickenson, cooling the overhead and the bulkhead behind the heater
- It circulates the heated air thru the cabin.