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S-F · 12-09-11, 11:35 PM

You're not trying to pump any air out. You are trying to create negative pressure under the slab. 5 cfm shouldn't happen. There's no way to pump air out of solid earth. It should be like sticking a vacuum to your hand or something like that.

12-09-11, 11:35 PM	#30
S-F You Ain't Me Join Date: Nov 2009 Location: Northampton MA Posts: 662 Thanks: 6 Thanked 71 Times in 58 Posts	You're not trying to pump any air out. You are trying to create negative pressure under the slab. 5 cfm shouldn't happen. There's no way to pump air out of solid earth. It should be like sticking a vacuum to your hand or something like that.