Yep. They're surprisingly effective if they're set up right. Good chunk of mine are half that, with some 100 and 120 in the mix. I just did another modification, pretty much the only thing left as pictured above is the three 80mm, the venturis have been split up and reworked as my 120V squirrel cage replacement, and while not quite as potent, draw a tiny fraction, and so far the best alternate I've been able to put my hands on readily. They're actually laid out as 3, with the fan shown down below the 3 in the "triplet" pic being used in the first one. I will definitely have to start a new thread with the pics of the new layout, as well as the "big" fan's new implementation. Collectively they're a *massive* improvement on anything attempted so far, and for slightly less power than before, I can track the outside temps within ~1C during a normal night cooling cycle. I'm not sure why I didn't figure this out sooner, but hey LOL
Steve