Source for rectangular RV a/c ducting

Chris Bryant wrote:
If you only have a short distance to go, I would make it using corrugated plastic sign board, available at Office Depot, and line it with Reflectix.
Otherwise, you could just build a nice ceiling assembly out of wood.

I had thought about taking a page from my grand mother's old house, but I'm removing insulation from our ceiling to add it, and figured that preinsulated ducting would be the least amount of sacrifice.

If you only have a short distance to go, I would make it using corrugated plastic sign board, available at Office Depot, and line it with Reflectix.
Otherwise, you could just build a nice ceiling assembly out of wood.

LarryJM wrote:

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

If you mean the plate that has the one baffle on it that breaks up the return and discharge air, then yes. There was no other hardware on this unit when it was removed from the roof of the fifth wheel (I investigated the donor unit to make sure that no parts were missing).

The discharge ducting came up flush to the 14x14 opening in the ceiling and was blocked in place so that the air would get forced into it when you closed the straight down discharge flap. There was two 2x8" rectangular duct lines going out into the ceiling, one towards the bedroom one towards the rear.

4X4Dodger wrote:
Why dont you try to find a wrecked newer travel trailer in your area and salvage the duct work out of that?

I drove quite a long ways just to find an A/C unit. Units up for salvage has been oddly low as of late. I'd have salvaged the ducting from it, but they had already torn the remainder roof off the ceiling out and most of the duct work was gone beyond where the A/C unit was at and what was left wasn't very salvageable.

Why dont you try to find a wrecked newer travel trailer in your area and salvage the duct work out of that?

I maintain a file of just about everything I have in TT. So I can get replacement or have owners manual on hand. Don't see this question very often. I play'd around on internet and found the same folks that make valves have a division for this stuff. Don't know if they can help or not as I've never used them.

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Oregon

12399 S.E. Capps Rd

Clackamas, OR 97015

Ph: 503-607-1325

Fax: 503-607-1330

I don't think I have ever seen sheet metal A/C ductwork- it's usually either formed in place Styrofoam, or corrugated plastic type. When I had to fabricate ductwork, I used a bit more room and fiberglass ductboard, but the stuff I used is fairly thick. Sheet metal will have to be insulated for this application, or you will have serious moisture damage.

I'd make it for you free... but the shipping would be expensive.

Very few RV's have METAL ducts in the ceiling. It is usually foam core flat board that is cut to the rectangle you want and then the edges are foil taped or glued. This has to do with WEIGHT and the fact that foam core board at the OEM level is easy to fabricate and install. Metal is not used due to the inherent NOISE that can happen especially in a Motorhome. Not a concern in Towables, but as I stated, weight IS a concern. Some ducting may appear metal, but that is due to the shiny silver inside of the foam core board. Doug

Halmfamily wrote:
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.

Agree on contacting a sheet metal shop. My DS works as sheet metal fabricator in one the make all kinds of specialized ducting. JMO

Great camper and project.

Try some of these places: http://www.rverscorner.com/rvsalvage.html