That's just some in-line duct fan from Lowe's. :stoned:
I think it is 250cfm if I'm not mistaken.:smokin:
I'm not familiar with HPS so can't really say opinion.:twocents:
It's no pussy fan though; it cools 6-26watt CFLs in one 22gal rubbermaid container.:thumbsup:
I'm scared to stick my fingers in it while its going, seems like it could chop or damage them.:cursing: