As
@The8thChevron said look into the company AC Infinity. They're are based in Cali which could help you going by your name!!
I purchased their 4" inline fan for my 3x3x6 and it's perfect, a very well made piece of kit that's quiet and with the added digital controller panel this makes for a gem of a fan!!
Quality company and I'll be getting one of their carbon filters next....😉