Routing your own furnace vents...
My trailer has in floor ducting. The most important of the three vents has never worked that well, and has gotten worse. Now the floor actually gets warm where the duct is likely leaking. I thought...
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I added two ducts to supplement the floor ducting. I added one to each side of the furnace from the existing knockouts. Connected to a vent on each side of the furnace through the cabinet. Tons of heat from the added vents and still a little from the floor.
