[N2TRUX]

You "can" do it with 4 or 6, but that's not the best way to do it. Each corner should have a fill and dump valve to prevent air transfer.

Here is a diagram showing 6 and 8 valve set ups.

Thanks to Suicide Doors-
[IMG]http://www.*****************/files/how_to/wire-diagrams/6valve.gif[/IMG]

[IMG]http://www.*****************/files/how_to/wire-diagrams/8valve.gif[/IMG]