Converting building “cavity” into a plenum?
I know that the use of building cavities, things like spaces between joists, rafters and studs shouldn’t be used as part of HVAC distribution. However if one had a “plenum” that covered the entire floor area, located in the ceiling, air distribution would be easy regardless of the partition layout below and the friction losses would be about as low as possible. So my question is how can I construct/build such a plenum and not have it be a building cavity?
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