Pro/Forums - View Single Post - contra-rotating fans

bobkoure · 11-01-2004, 05:37 PM

well... yeah.
For those folks interested in contra-rotating fans, here's a way to play with the technology for $4US.
Meanwhile, I'm still trying to find a heater core in the 6"x6" to 6.5".6.5" by 1" range with inlet/outlet on the "front" of the header tank (or tanks) single or double pass not a big issue for me given the low flows I'm using.
My two leading candidates are the

fedco 2-524: 6.25x6.375x1

and the fedco 2-761: 6.625x6.188x1.625

Both are too thick for really quiet operation. The second one, given no bottom tank, is probably even more restrictive than I'd like.
I'd just buy cases that better fit the BI Pro II or III if I weren't trying to retrofit a number of boxes that were already nicely set up for the "big momma" 6.125x6.125x2 heater core.

11-01-2004, 05:37 PM	#10
bobkoure Cooling Savant Join Date: Feb 2003 Location: USA - Boston area Posts: 798	well... yeah. For those folks interested in contra-rotating fans, here's a way to play with the technology for $4US. Meanwhile, I'm still trying to find a heater core in the 6"x6" to 6.5".6.5" by 1" range with inlet/outlet on the "front" of the header tank (or tanks) single or double pass not a big issue for me given the low flows I'm using. My two leading candidates are the fedco 2-524: 6.25x6.375x1 and the fedco 2-761: 6.625x6.188x1.625 Both are too thick for really quiet operation. The second one, given no bottom tank, is probably even more restrictive than I'd like. I'd just buy cases that better fit the BI Pro II or III if I weren't trying to retrofit a number of boxes that were already nicely set up for the "big momma" 6.125x6.125x2 heater core.