I have a in-wall heater just like this one:
It sucks cold air from lower part of vent, heats inside, and blows it out in the upper part of the vent.
Now I have the basic problem of putting a wooden cabinet in front of it. I can let the cabinet 8 inches away from the wall, but that doesn't solve my issue. The air stays hooked in that small region. The cabinet heats, which is not a problem. The problem is that the room stays cold!
What I really want is a different cover with a custom air ducts. I want the heater to suck air from the floor, heat it, and blow it straight to the top:
Is there an easy way to build these ducts myself? Remember the ducts must be heat-resistant!