Hello all - new to the forum and perhaps more *shockingly 
not an electrical engineer nor circuit designer. So anyway, I have this fan I want to repurpose that I think is a pwm fan as it has 4 wires and is intended to plug in to the motherboard on a tankless water heater. I'm going to make an air cooled av cabinet with it as it is fairly quiet for the volume of air it moves. It's like a small squirrel cage fan with 4 wire config. The rating on the fan says DC43V Vcc12V 42W.
So, I'm looking to power this with speed control ideally but not necessarily. From what I can find it would be simple to just splice the output wires of any ac adapter wall wort etc. with the proper output. Problem is I'm not sure what I need - I assume 43V and about 1A, but I'm not sure about frying things with a switching power supply/adapter. I am thinking a switching ps/adapter is what I need for this application - I am wanting as little excess heat as possible. Also I'm not sure if I need a supply with a greater rating like 43V 3A or a lower amperage and just allow the fan to run at a slower speed - or if it would even run at say 600mA. No luck of course finding anything with the exact specs but I have found some ps like meanwell that seem to have a range covering what I need - although still not sure about speed control as well as what the Vcc12V in the rating even means.
Last issue is fairly basic - how to id the wires. They are red yellow brown and blue. I was thinking red should surely be + and then just test resistance between red and all the others and the most conductive would be - right? I did try to power with a 12v 2.5A adapter I already have and just got a very faint buzz from the fan.
Any help is much appreciated as I have been looking at power supplies for about 2 days now lol. Thanks in advance
not an electrical engineer nor circuit designer. So anyway, I have this fan I want to repurpose that I think is a pwm fan as it has 4 wires and is intended to plug in to the motherboard on a tankless water heater. I'm going to make an air cooled av cabinet with it as it is fairly quiet for the volume of air it moves. It's like a small squirrel cage fan with 4 wire config. The rating on the fan says DC43V Vcc12V 42W. So, I'm looking to power this with speed control ideally but not necessarily. From what I can find it would be simple to just splice the output wires of any ac adapter wall wort etc. with the proper output. Problem is I'm not sure what I need - I assume 43V and about 1A, but I'm not sure about frying things with a switching power supply/adapter. I am thinking a switching ps/adapter is what I need for this application - I am wanting as little excess heat as possible. Also I'm not sure if I need a supply with a greater rating like 43V 3A or a lower amperage and just allow the fan to run at a slower speed - or if it would even run at say 600mA. No luck of course finding anything with the exact specs but I have found some ps like meanwell that seem to have a range covering what I need - although still not sure about speed control as well as what the Vcc12V in the rating even means.
Last issue is fairly basic - how to id the wires. They are red yellow brown and blue. I was thinking red should surely be + and then just test resistance between red and all the others and the most conductive would be - right? I did try to power with a 12v 2.5A adapter I already have and just got a very faint buzz from the fan.
Any help is much appreciated as I have been looking at power supplies for about 2 days now lol. Thanks in advance
