What you might find is the furnace has four possible opening to install vents. Two on each side. In my 21QB the two on the right go forward, one under the fridge, the other to the bedroom. Only one is used on the left and it's the vent that burns your feet.
The bad news is there isn't room under the sofa to reroute that duct forward.
I tapped into the duct that ran under the fridge to supply heat to the bathroom. Basically I used a "Y" connector from my woodworking dust collection system, some dryer vent duct, and a vent off of Amazon. Total time was about one hour.
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2017 JayFlight 21QB
2021 Ford F150 SCrew 3.5 Eco, 157”, 3.55, Tow Pkg
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