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Old 05-17-2012, 07:42 PM   #15
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I believe they preasure it with a fan in the top vents. I don't know the exact preasure, but it shouldn't take too much. They use a soap like the bubble soap little kids use to blow bubbles.
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Old 05-17-2012, 07:47 PM   #16
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here is a link to a video of how it works

RV Leak Test - YouTube
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Old 05-17-2012, 09:10 PM   #17
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Quote:
Originally Posted by bbeane View Post
Call me a little skeptical, I wonder how much pressure they can build up, lots of stuff to tape up to get any where close to air tight. Especally in a motorhome.
Doesnt take a whole lot..
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Old 05-18-2012, 09:38 AM   #18
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I had a Thermal audit done on my home where they create a negative pressure within the house via a fan system installed in the front door.

Utilizing thermal cameras, I was amazed at the amount of air leaks that were allowing cold air to enter.

Plumbing fixtures, electrical outlets, central vacuum system, improper installation of insulation, etc.............were all allowing cold air in.

I think I will try the bubble method on my Roadtrek utilizing the Fantastic fan to see what pops up.
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Old 05-18-2012, 04:00 PM   #19
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Yes, it needs a lot of volumn, but not that much pressure. For example, a shop vac, or even a vacuum cleaner set to "blow" will generate as much as 3-5 psi. More than that would probably blow thhe coach apart. You just want to see where the air is escaping from, and the bubbles will find that.

HTH
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Old 05-18-2012, 11:59 PM   #20
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No shop-vac or leaf blower home-brew idea will generate the required volume of air to pressurize an RV to the standard 3-4 psi the SealTech system uses. There are far too many places air leaks into/out of the RV. For instance around slides, windows, doors, exterior hatches, etc.
When we purchased our 5er the advertisement said Grand Junction uses a "rain-room" to leak test their units. A week after purchase I noticed a wet carpet below a window. The dealer used a SealTech machine to locate the source. That leak was over 14' from where the carpet was wet. After sealing that leak the tech retested, and found 3 more tiny (as yet) undetected leaks. It works very well and is worth every penny you spend.
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Old 05-19-2012, 09:57 AM   #21
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That's all good info. When I get into my coach (soon), I'll keep that service in mind if I need it.

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