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Millions of kitchen cabinet sink bases have been put over a vent in the floor with just a register installed in the toe kick. It should not cause a problem or they would have quit that practice a long time ago. I've never had any issues doing it this way. The forced air will just build up pressure under the window seat and be forced out the front where you've put in the register.

Your only talking about short burst cycles of either heated air or cooled air, not prolonged exposure.

I don't see a problem.
 
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