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those ceiling mount units ... not sized for typical US construction techniques, so installing them in an existing ceiling can be quite complex. If you're doing new construction, it is possible to correctly frame up the ceiling so that installing them becomes trivial.

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There are two kinds available currently for ceiling.

The cassette, that would fit into a drop ceiling, and there is also a mini-ducted unit, installed in the ceiling with small-run ducted ports.

My favorite are the ones that look like picture frames.

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