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Old 06-12-2020, 11:34 AM   #1
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A/C ducting

Does anyone have a diagram of the ductwork in a Berk 40E or similar?
Trying to figure out why the ducts in the front of the coach seem to puff. It happens in heat or cool modes.Thanks
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Old 06-12-2020, 01:30 PM   #2
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you'll have to explain what your 'puff' means...
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Old 06-12-2020, 01:46 PM   #3
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Puff

The flow is not smooth and continuous. It’s like the air expelled from one’s mouth when you say “puff-puff-puff.
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Old 06-13-2020, 07:42 AM   #4
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I would suggest removing each vent and do your best to look down each vent to see if there is any debris. I use my camera on my phone with a light.Click image for larger version

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Old 06-14-2020, 03:12 PM   #5
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So do all three a/c units distribute to all of the vents evenly, and do all of the returns feed all of the a/c units evenly (when functioning properly)?
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Old 06-15-2020, 06:43 AM   #6
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All 3 airs distribute to all the vents.
Side to side Returns are isolated to Each Air
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Old 06-15-2020, 12:56 PM   #7
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Does anyone have a diagram of the ductwork in a Berk 40E or similar?
Trying to figure out why the ducts in the front of the coach seem to puff. It happens in heat or cool modes.Thanks
Is it on one side of the duct or on both sides?
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Old 06-15-2020, 03:56 PM   #8
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Seems to be on the passenger side mostly forward.
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Old 06-15-2020, 03:58 PM   #9
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Seems to be on the passenger side mostly forward.
I would check the duct on the passenger side for debris,
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Old 07-12-2020, 05:04 AM   #10
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Ducts and Returns

I checked the returns with an inspection mirror- they looked good.
Does anyone know how to remove the Duct vents so I can look there?
There is some kind of particles that are being expelled accumulating on surfaces.
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Old 07-12-2020, 09:43 AM   #11
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The vents have a snap ring around the perimeter that covers the installatiin screws.
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Old 07-12-2020, 03:58 PM   #12
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Pry it off?
Any ideas?
Thanks
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Old 07-12-2020, 05:09 PM   #13
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Carefully take a puttyknife or small screwdriver and work around the edge.
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Old 07-12-2020, 06:15 PM   #14
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I’m checking for blockage. I have a feeling that I won’t find it until I get up on the roof. Roof hard to get to without a ladder.
Thanks for the help.
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Old 07-12-2020, 06:28 PM   #15
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... There is some kind of particles that are being expelled accumulating on surfaces.
Is it not styrofoam?
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Old 07-13-2020, 06:13 AM   #16
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It's more like a fine light colored dust. if I wipe the counter top with a damp paper towel (I know- wasting a valuable paper towel) after running the ac for a day the dust will discolor it.
Could it be something under the fan shroud?
Still trying to figure how to safely get on the roof.
Thanks
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Old 07-13-2020, 05:23 PM   #17
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If its not coming from inside the unit. need to remove the ac shroud and make sure the black ABS cover is secured down well so its not drawing air from the exterior. Where are you camping? Is the pollen high in your area or are you in a dry arid area that has a lot of fine dust blowing through the air? The ac nor the ducts have any material that would be in the category of fine dust. Black expansion foam or white polystyrene would be a building material culprit. The other thing to check is that it has a good seal around the base of the AC. There is a foam gasket that should be centered over the opening that leads to the interior ducts. If for some reason this is not secured squarely over the cutout there could be exterior air getting into the intake.
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