Source for rectangular RV a/c ducting

When my father owned his HVAC company he had to form all of his rectangular metal duct work. You might want to call some local metal fabricators who have a break and see if they can make it for you.

Later in his career he switched to insulated duct board which he could fabricate on sight and was already insulated. Much easier to work with. You can get that at a local supply house or Graingers.

JoeChiOhki wrote:
Hey all, I'm having a bit of trouble locating a source for the narrow rectangular aluminum ducting that is used (usually in the ceilings for A/C units) in RV HVAC systems.

I'm in the process of restoring a 40 year old RV, and am adding a roof A/C unit. The used A/C unit I ended up obtaining is designed for ducted use (though it can be run with a straight down discharge), and since I already plan to take down the interior ceiling, and figured it would be a good time to route a duct line over into the nearby cabinets so I can add A/C ducting around the unit instead of just freezing us out in the dinette :).

Thanks!

Do you have the A/C discharge plenum specific to the A/C unit you obtained for ducted installation. Improper installation can cause all sorts of issues such as evap freezing up, poor cooling, etc. This includes very specific duct sizes and min number of registers again of a very specific size.

Larry

Old-Biscuit wrote:
Contact Heartland and inquire????

LOL, completely forgot I joined the Heartland owners group after I bought that trailer. Wonder if my account still works....

Thanks for reminding me!

Contact Heartland and inquire????

Old-Biscuit wrote:
Just use round flexible ducting

LINK

The ceiling is only two, maybe three inches thick, frame-wise, the rectangular duct work will fit as its 2" tall (I'm taking the measurements from the ducting that's in my fifth wheel), but I'd have to crush the hell out of the round ducting, plus it would be a great deal more difficult to box it in as the Duo-Therm Quick-Cool (This thing is bloody over kill, but for $150, I'm not complaining) I got doesn't have any special output connectors, you just box in the ducting in the ceiling and install the inner diversion plate for the air return and discharge.

Round will work for the rest, but I need a rectangular section to use as the main trunk from the A/C unit into the wardrobe cabinet where I can branch it off without wasting space.

Just use round flexible ducting

LINK