Is it ok to blow hot air under the floor?

Question

I have two story house and downstairs is always colder. Head feels fine but feet are cold and you can feel cold coming from the floor.
The house have no basement but is built on a concrete slab. The living room is on 2 inch raised floor. I have one opening and was able to see that the raised floor have perfect passages from one side to the other. There aren't any fire breakers. I realized that I could somehow direct hot air from some of the duct and make the floor warm.
Is something like this feasible or is there something that just do that or similar?
I found air radiant floor heating but that's inside concrete.

ojait · Answer

Using a floors bay as a duct isn't new. Many furnace and central air systems use the space between (2) joists/studs for the return air that goes back to the HVAC. It's usually closed off at the bottom with sheet metal and such.
Most municipalities will approve such a set-up. If you decide to construct this type of floor duct for heat you should consider:
where will the warm forced air exhaust? you stated the floor is open but unless you cut-in floor registers the warm air will ultimately find its way outside not to mention how the slab will cool the warm air. Either way I believe you will be using and wasting alot of energy.
wouldn't make more sense to route the duct directly into the room that is cold? Bring it through a wall low to the floor with a register?

Is it ok to blow hot air under the floor?

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