Quote:
Originally Posted by S-F
Just get anything like that with some PVC, some silicone and some PVC cement. You'll also need a hole saw the size of the pipe and some way to drill the slab. I don't know how the pro's do it but they cut a perfectly sized hole in the concrete.
Why do you think 3" pipe is easier to work with? Personally I see little difference aside from the 4" being (probably) more effective.
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I already have the hole.. I'm going to use a sump cover and seal it down.
Maybe I'm wrong, but when I looked at that chart, and pictured trying to
pump air out of the hard packed dirt and rock under my slab,
I figured maybe 5 or 10 cfm..?.
If my cover plate is good & tight.
Can't see why anything larger than 1" is even necessary.?.
Seems like the volume of air going outside is going to be very low..(& slow moving).
Fantech says it's okay to use 3", and I have at least one tight spot
(floor joist x-bracing) where I'm pretty sure that a 4" pipe will not fit.
There is one X-brace like this,
http://i469.photobucket.com/albums/r...DSC_1138-1.jpg
in the channel where I want to run the 25' pipe.
Maybe a 3" will fit under the 'X', but I'm sure a 4" won't..
I think the space between the bottom (center) of the 'X' and the ceiling tile
strapping is about 3.5".. (I hope).