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Blackeagle · 02-22-2003, 08:03 PM

Well you can't use that 300CFM one as it is only in 24/48v. Although you could run a 24v @ 12v.

They do offer it though in 12v at 235CFM at about 54.5dba and .75 inches of H2O.

Now if you set up your 120's as delta 152CFM screamers @ .571 inches of water, they would offer a high performing set up, but I don't think they'd be any better than the 172 Comair Roton. Air flow would be about the same through the rad.

But the dual 120's will take up more space due to the second shroud, and two of these deltas will produce 56dba. I'd go with the 172mm fan.

Reasoning is this. The dual Deltas are louder, and the larger the fan is most often the lower the pitch of the noise from it. So even if the dba rate was equal between the 172 and the dual 120's it would seem less intrusive due to the lower pitch. And the noise rating is without any resistences. With the duals you have 2 fans creating extra noise from the turbulence between the fans and the rad fins. The larger 172 will have more turbulence than a single 120 but not as much as two.

BE

02-22-2003, 08:03 PM	#2
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	Well you can't use that 300CFM one as it is only in 24/48v. Although you could run a 24v @ 12v. They do offer it though in 12v at 235CFM at about 54.5dba and .75 inches of H2O. Now if you set up your 120's as delta 152CFM screamers @ .571 inches of water, they would offer a high performing set up, but I don't think they'd be any better than the 172 Comair Roton. Air flow would be about the same through the rad. But the dual 120's will take up more space due to the second shroud, and two of these deltas will produce 56dba. I'd go with the 172mm fan. Reasoning is this. The dual Deltas are louder, and the larger the fan is most often the lower the pitch of the noise from it. So even if the dba rate was equal between the 172 and the dual 120's it would seem less intrusive due to the lower pitch. And the noise rating is without any resistences. With the duals you have 2 fans creating extra noise from the turbulence between the fans and the rad fins. The larger 172 will have more turbulence than a single 120 but not as much as two. BE Last edited by Blackeagle; 02-22-2003 at 08:24 PM.