I have a 2005 359ts. If I look outside on the passenger side of the coach I can see two small round vents not far from the refrigerator vents. On the inside next to the refrigerator is a wooden grate that is the air intake for my furnace. I am sure the furnace is behind that grate although I have never tried to actually remove it or get to the furnace.
Go online and look for a photo ani I am sure you will see the air intake and vents are on opposite ends of the elusive little rascal.
Hope this helps.
Life is a journey, not a destination.
2005 Georgetown 359ts
Bill & Virginia, Kentucky
Nights camped in 2011...78 , 2012...73,
Nights camped in 2013...123, 2014 ...101