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Premium Member
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Discussion Starter #1
Just figured I would throw this out for discussion. I'm battling water/ condensation in under- bed toolboxes on flatbeds. The box can be clean and dry, with a good door seal. Close it up, come back 24-36 hours later and depending on humidity levels there can be water droplets clinging to the walls and small puddles in the bottom. It's bad enough that if I leave my toolbag in the box overnight, some of my tools develop light surface rust. We're having the same issue on a few of our other trucks.

The boxes are mounted by bolts through the top and one end with large plates inside to distribute the load. We've tried silicone/ RTV around the bolts and under the plates, with no noticeable changes. More ventilation might work, but the only way to get that is to leave the box open which isn't an option. Dessicant packs would work as well, but it seems like that would require a lot of dessicant and changing it often.

Anyone have a suggestion?
 

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Administrator
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I watching also, we struggle with the same issue on our trucks at work. I think somehow ventalating is the solution, because the more airtight you try to make them the worse it gets.
 

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Senior GTT Super Slacker
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I think Kennyd hit it. Need to drill some vent holes.
 

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Official "Groovie" Dude
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Could use a small vent grille RV's use to vent batteries. Small and fairly flush and if mounted on the backside you wouldn't see it and would be away from direct water.
 

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Here are McMaster-Carr's desiccant offerings, and the catalog gives the cubic feet of the container it's rated for; but you need ventilation to minimize the condensation issues you're having. I'd say you need at least two vents per toolbox to get some sort of air flow through the box.

McMaster-Carr
 

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Senior GTT Super Slacker
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37,506 Posts
Here are McMaster-Carr's desiccant offerings, and the catalog gives the cubic feet of the container it's rated for; but you need ventilation to minimize the condensation issues you're having. I'd say you need at least two vents per toolbox to get some sort of air flow through the box.

McMaster-Carr
I bet they sell the vent louvers also.
 

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Discussion Starter #10
The RV vents are a good idea. Just have to figure out where to put them. The only place that they probably won't get sprayed with water is on the back of the box, but it doesn't do much for airflow having them both on the same side.
 

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Something is better than nothing, even if the location isn't ideal. For all I know the turbulent air flowing in and around the unaerodynamic chassis may give you all the flow you need.
 
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