[sevisehda]

I bought my first blower today. Its a beast compared to the fans I'm currently working with. When I'm done it will be mounted inside a radiator box. I've only tried it at 5V at which it pulls 4.25A. I have no solid number for CFM but there is a definate breeze coming from it. Now for the questions...

To test it I used an old AT 250W PS. It didn't seem to like a cold start. It would jerk slightly then stop, I'd have to shutoff the PS then try again. My guess is that it requires more startup Amps then the PS can handle so the PS shuts off. It will start as long as I manual spin it before I apply power. Other than a larger PS can I add a cap or something to help it start?

Secondly this blower is "naked". Is a shroud required for it to operate well? I will be building a radiator box around this so I was planning on cutting a 5" diameter hole for in the intake and just let it suck air into the box. The only escape for the air would be through the radiator.