Source for rectangular RV a/c ducting

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.