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Heating, Ventilation & Air Conditioning Q&A

AC ducting

Unread postby Filthy Beast on Thu May 08, 2008 12:51 pm

Thought I might be able to tap the resources here. I have been having an issue getting cool air out of one on my vents in the rear kitchen. Today I took off the vent cover and looked up there with an inspection mirror. I found that the cavity cut into the styrofoam went all the way to the back of the fiver to where the venting for the refrigerator goes through the roof. I could see light from the refrigerator vent. Would there be any reason for the ac to vent into this area besides the obvious one that someone just cut the styrofoam too far. :o
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Re: AC ducting

Unread postby Zinger on Thu May 08, 2008 8:49 pm

i wouldnt think it should vent to the reefer try plugging it
Have a good one
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Re: AC ducting

Unread postby skipnchar on Thu May 08, 2008 9:45 pm

i'm having a little trouble understanding just WHERE you're looking. Your RV DOES have metal or plastic duct work running back to the AC doesn't it? I wouldn't think that any of these ducts would open to ANYTHING other than the AC and the opening to where they dump the air out.
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Re: AC ducting

Unread postby PrivatePilot on Thu May 08, 2008 10:21 pm

Visualizing what your explaining, it certainly sounds off, that's for sure - I wouldn't see any reason at all that the A/C ducting and fridge venting intersecting at any point, and actually, if that is indeed what's happening, it could quite possibly be dangerous since it's possible that CO2 from the fridge (when running on propane) could backup into the interior of your TT.

Is this a new unit that's still under warranty?
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Re: AC ducting

Unread postby Filthy Beast on Fri May 09, 2008 6:53 am

skipnchar, the ducting is actually made by voids in the styrofoam in the ceiling. I will just plug it and go to the other end and plug it there so that there are no potential critter homes in the winter
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Re: AC ducting

Unread postby Cobra909 on Fri May 09, 2008 11:25 pm

Yep, a few brands are using this type of "ducting" now. About 6" to 12" past your last vent, use the low expanding foam (for doors/windows) to completely seal the duct. Another hint for better cooling/air flow. In this type of construction, they put the insulation for the roof, leave the voids for the A/C ducts, then put in the ceiling. They use a hole saw to cut through the ceiling to mount the round air registers. Usually there is a pretty good gap between the sides of the hole and the plastic of the register. Use foil tape (not duct tape), cut in thin strips to seal this gap. Now, you won't be cooling the inside of the ceiling.
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Re: AC ducting

Unread postby Filthy Beast on Sat May 10, 2008 7:05 am

That is kind of what I thought. Thanks
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Re: AC ducting

Unread postby DFH-GMC on Sat May 10, 2008 9:49 pm

I also had a problem with cooling the ceiling I found this out while cleaning the roof while DW was cleaning the inside. I used foam tape to seal the ducting, what a difference. I suspect this more common than most folks realize.
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