Is your crawl space floor finished or sealed? What are the soils? Is it damp? We've done several unoccupied crawl spaces and have put a 6mil. poly down as a vapor retarder. Now the code dictates that a 10 mil. vapor barrier under all slabs is required. I'm not saying you need 10 mil., but a 6 mil. would contain the moisture under that space. If your soils are sandy and dry then venting below the vapor barrier would probably not be necessary. If you think it will be then a run of 4" perforated drain tile scratched into the soil under the vapor barrier as a way to vent it. A run in the center with trunks off of it is effective. Hook onto or continue one end to an outside source and let it breath. If you don't think the moisture in the crawl space is high than a vapor barrier may not be needed. I have seen assemblies that have installed a fan on a humidistat to control the moisture, but again a simple free air vent might do the same for you.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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