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Old 06-20-2014, 01:36 PM   #1
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Volume of air coming from A/C ducts

We have a 15 k AC in our fifth wheel. If you open the quick cool air dumps on the main unit it will freeze you out of the main room so it is cooling. My question is the ducting. There are 5 vents. The amount of air coming out of them is not balanced. Air comes out of the three in the main room at a moderate to low rate. These vents are all 3 to 6 feet from the A/C unit. The vent in the bathroom, which is the farthest away, blows really strong and cold. The vent right next to it in the bed room is poor.

I asked the dealer to check on it along with my other punch list items. They said it was ok and just "the way it is". They said it was not going to be balanced. I don't believed it.

Anyone have any ideas or advice? Thanks in advance.
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Old 06-20-2014, 02:23 PM   #2
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Take the outlets down, look inside, you find that the ducts are in two pieces. Take duct tape and cover the seams. the ac is going out through the seams
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Old 06-20-2014, 03:12 PM   #3
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Take the outlets down, look inside, you find that the ducts are in two pieces. Take duct tape and cover the seams. the ac is going out through the seams
That is just shear laziness on behalf of the dealer.
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Old 06-20-2014, 03:49 PM   #4
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That is just shear laziness on behalf of the dealer.
They just do not know any better
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Old 06-20-2014, 04:18 PM   #5
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Thanks for the advice. A storm came through the campground so this gave me something to do while stuck inside. Several of the vents had tape but it did not seal anything. On two of the five vents, they had pierced part of the inside insulation with their hole saw during installation. I sealed those holes too.

Now to finish the job, is it easy to get to where ever the A/C unit blows the cold air in?
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Old 06-20-2014, 07:05 PM   #6
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Now take a flashlight and a telescoping adjustable mirror if needed, and look in the run/ducting, and see if they sealed the end of it or if it's dumping into your attic.
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Old 06-20-2014, 07:27 PM   #7
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Now take a flashlight and a telescoping adjustable mirror if needed, and look in the run/ducting, and see if they sealed the end of it or if it's dumping into your attic.
That's just the thing. It is not a duct like I was expecting to see. It's like a void between the interior ceiling and the roof. When I stick my hand in a vent, I can move it around 360 degrees.
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Old 06-20-2014, 07:29 PM   #8
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Now take a flashlight and a telescoping adjustable mirror if needed, and look in the run/ducting, and see if they sealed the end of it or if it's dumping into your attic.
Use this method to make sure the duct has not been crushed between the 'good' vent and the 'bad' vent.
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Old 06-21-2014, 09:53 AM   #9
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That's just the thing. It is not a duct like I was expecting to see. It's like a void between the interior ceiling and the roof. When I stick my hand in a vent, I can move it around 360 degrees.
The ceiling duct is made of 1/2 inch foam board, it is maybe 6-8 inches wide and only about 1 inch tall inside. It has to fit in a gap of the aluminum roof truss, so there is a 1 inch square tube below the duct and another one above it. The vents are not cut until the roof is finished, they use a hole saw and cut thru the ceiling panel and then thru the 1/2 inch foam board. If they cut too deep they can punch thru the top of the duct. The plastic vent is attached to the ceiling panel and aluminum tape is used to seal the vent to the duct, but not always that good. If the duct has been pushed down or the ceiling pushed up, there will be very little space for air to flow into the plastic vent. Or the duct may be collapsed elsewhere due to carelessness or too much insulation being pushed down on top of the duct.
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Old 06-23-2014, 04:49 PM   #10
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Do the ceiling cover plates for the A/C just snap on. After reading the issues I want to check out my vents.
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