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Originally Posted by Gooserider
Whenever I get anything used I usually figure about 50-60% of new, possibly 75% if it's a really nice item or is high demand. As I recall an Eheim 1250 is around $70-80 new, so the low end of that range is probably about right. Don't forget to include shipping costs, if any, when calculating the price.
The best value is usually automotive heating cores both for price and cooling performance. Check Airspirit's Heater Core data base to figure out what size you need. However, the pix I've seen of the BI rads look like they use an automotive style design, so they wouldn't be to bad. IMHO the critical things when setting up a rad is that you should NOT just strap the fans to the rad face, instead use a shroud to space the fans AT LEAST ONE INCH off the face of the rad (2" is better) to both improve cooling and reduce noise. Per BillA, fans work better when they 'suck' through the rad instead of trying to 'blow' through it. Last, you should have at least 1-2" of clear space on the other side of the fan as well.
Gooserider
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I'm not stupid, thats with SH...
Hmm Although it would reduce some of the sound it does take too much room, sucking through and pushing through should perform the same if you put the fans on right...