12-17-2018, 02:03 PM
The 120Mm fan size has so many options, but 4.75"=120mm and would present issues for your 4 inch vet diameter desire.
92mm is 3.62 inches.
I Do not know if the slightly lower rpm 120 MM delta fans respond to voltage control like my newest 92mm delta fans do, but the 252 cfm 120mm delta fan does not, nor could i get it to respond to a PWM signal sent on the 4th blue PWM wire.
The Silverstone fm121 do come with potentiometers and built in speed controllers. exteding the wires for a distant potentiometer is simple wire splicing. I have not used one potentiometer to control a pair of ss fm121 fans but it should not be an issue to do. They are a good dual ball bearing fan with good airflow and speed range.
The Noctua industrial 3000 rpm 120mm fans are impressive, but I have suffered two fan failures, and although they were quickly warrantied, if I were out on the road during failure getting a new one would be a PITA.
If 92Mm fans are what you decide to use, well my latest 7k rpm have the power and speed control abilities on the 5a voltage bucker, but there could be more efficient options in a narrower or lesser speed range. The brute force of these 7k rpm 92mm fans is impressive, but it is like a loud stereo turned up all the way, when the best part of the song is over, turning down the volume becomes necessary, quickly, but it was nice to have that volume available to tickle ones bones and the inner surface of one's skull.
I'll blast these 92mm fans aimed at me at high rpms briefly when I am a sweaty mess, but thats about it. The rest of the time they will likely be in the 700 to 2000 rpm range, and there are likely many fans which can move the same air for much less wattage consumed to do so in this range. But I want that 7k rpm on tap, so I accept that compromise.
92mm is 3.62 inches.
I Do not know if the slightly lower rpm 120 MM delta fans respond to voltage control like my newest 92mm delta fans do, but the 252 cfm 120mm delta fan does not, nor could i get it to respond to a PWM signal sent on the 4th blue PWM wire.
The Silverstone fm121 do come with potentiometers and built in speed controllers. exteding the wires for a distant potentiometer is simple wire splicing. I have not used one potentiometer to control a pair of ss fm121 fans but it should not be an issue to do. They are a good dual ball bearing fan with good airflow and speed range.
The Noctua industrial 3000 rpm 120mm fans are impressive, but I have suffered two fan failures, and although they were quickly warrantied, if I were out on the road during failure getting a new one would be a PITA.
If 92Mm fans are what you decide to use, well my latest 7k rpm have the power and speed control abilities on the 5a voltage bucker, but there could be more efficient options in a narrower or lesser speed range. The brute force of these 7k rpm 92mm fans is impressive, but it is like a loud stereo turned up all the way, when the best part of the song is over, turning down the volume becomes necessary, quickly, but it was nice to have that volume available to tickle ones bones and the inner surface of one's skull.
I'll blast these 92mm fans aimed at me at high rpms briefly when I am a sweaty mess, but thats about it. The rest of the time they will likely be in the 700 to 2000 rpm range, and there are likely many fans which can move the same air for much less wattage consumed to do so in this range. But I want that 7k rpm on tap, so I accept that compromise.
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