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Originally Posted by Noldor
...I'm looking for silence, I'm willing to compromize abit...
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For a blower, I'd suggest a single motorized impeller BUT with 2" thick cores I don't think you're going to get below 25dB or so.
IMHO, you'd have better luck with a thinner core.
If you haven't already, go to
this ProCooling forums thread and download
cores.zip.
Unzip - open the one named "cores-dimension-reference" - go to the "thickness" column and use Excel to sort on that column. Voila! You now know what sized heater cores you can get in thinner thicknesses.
To see what the cores look like and get a price, use the other spreadsheet to cross-reference the car model that uses that particular heater core and go to partsamerica.com or rockauto.com to look up the heater core.
To just look at the core, you can use this link
http://www.partsamerica.com/product_.../FEC/2-703.jpg
once you modify it - change the 2-703 to the core number you're interested in. There used to be a way to hack this site's links to get prices for heatercores, but they seem to have changed their system.