Hi Cliff, I just looked at those fan specs and they look great with them falling in range of the 2.5cfm that I am after. Noise is great too. Thanks, Hugh If you find your axial fans do not give you the CO2 scrubbing performance you want, Digikey.com has quite a nice selection of small radial centrifugal fans. As an example http://www.eminebea.com/content/pdf/TMP00124/I/bg0703.pdf They make these fans/blowers to fit the mounting arrangements for small axial fans so they may not take up as much room as you might expect. That's what I call faith in a father, to be sealed up in a steel can for several hours based on your reassuring word! Or it could be, that with two subs under contruction, this is the only quality time she can get with you! Cliff
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