Case Fan Cable Extender Max Length

[Slapalax]

I'm building a custom "PC in a Desk" similar to what LTT did in the last year, and am having a conundrum while working on fan wiring. I have 3 intake fans on the front right of the desk/case, and 3 exhaust fans on the middle left. My problem is this: Though I have a Swiftech Fan Splitter, there's no way that the fans will be able to reach the 3 or so feet that they need to go. I've found larger fan cable extenders from BitFenix (https://goo.gl/drBBf3), but I don't want to sacrifice brightness or speed by extending the cables. Does anyone know whether extensions like the ones linked above are okay or not? (By the way, the fans are Anidees AI Halo Crimson fans, they ARE NOT PWM)

[LogicalDrm]

Not with those lengths. Even USB which starts to have problems when cables are over 5m long.