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Old 01-15-2025, 11:00 AM   #1
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Furnace intake 2002 national

I have a question about were the furnace intake goes to? The ductwork goes from the furnace to the floor then through the outside compartment and back up through the floor behind the refrigerator. Does this go to ceiling a/c ductwork? Can not find the intake, any advice for my 2002 national sea breeze 35’ gas home
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Old 01-15-2025, 01:16 PM   #2
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I have a 2002 Winnie and my and my friends and RV'ing acquaintances floor furnaces have the air intake from a grill adjacent to the furnace. This is important to keep uncovered. Mine is in the bedroom right next to an exterior wall directly above the furnace compartment. (I have another grill in the bedroom but it's the passive input to the wet bay, which most RVs have).

The hot air output goes to the underfloor vent system. I don't recall ever reading about or visiting any RV friend where the gas furnace output was ducted to the ceiling. In my RV there are 4 output grills in the floor starting in the bathroom in a line into the living room. There isn't one in the bedroom except for the intake. The air out of those grills is very comfortably warm and gets the RV up to temp in just a couple minutes.

So, look for the intake floor grill right above the furnace (or at least very close too), and I guess the easiest way to find the output grills is to turn the furnace on and go feel. My '94 Bounder had the same setup and my brothers, friends, and RVing acquaintances do too. None of those various RVs had the gas furnace blowing into the ceiling duct work...that's for the roof mounted ACs and heat pumps and basement heat pumps. Makes a good raceway for TV wiring as well.
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Old 01-15-2025, 01:35 PM   #3
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Thanks,the heating ducts are side of cabinet but no intake,grill is were heater is but no intake when removed, still trying to locate
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Old 01-15-2025, 02:16 PM   #4
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There will no return air ducting like there is in a regular house. Generally, the return air is drawn through the basement in order to supply heat to the basement. If you find a grill that just goes to the basement that is the return. No filter on the return either you have a newer high-level coach and I have never seen one of those coaches.
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