Some light sparring in another thread got me thinking about the boxed in Class A inside a living space. Obviously Class A isn't going to radiate a ton of heat (hence the relatively low 2" CTC requirement), but would putting floor registers normally used for HVAC vents into the sides of the drywall enclosing the Class A allow any usable heat to "escape" into the living space at all? Anyone here tried it? Not sure I can talk the wife into from a cosmetic perspective, but I'm admittedly curious.