If it's a Mattamy home then there will probably not be any power / wire to that outlet under the fireplace that is integrated to the cabinet.
Even if you do buy a fan kit via Mattamy then they often just run a wire to some random loose outlet box under the fireplace.
When Mattamy does this, they have often left behind multiple electrical code violations that one day could very easily cause serious problems for an unsuspecting homeowner.
These common electrical code violations (below in photo) are usually a result of the wrong type of outlet box and outlet cover being used, the wire not protected a the sharp metal hole into the cabinet, and they usually leave the outlet boxes loose and not securely attached to the cabinet as required.
Basically hackers, but, as a result of "inspections" by myself and maybe others, this problem has been getting better at the newest Mattamy homes.
