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I may be mistaken, but it looks like you are paying for the brand name with the more expensive combo. Both combos come with a 6" fan, though the cheaper combo's fan moves more air (454cfm vs. 270cfm).
Can't say, as I have used neither! If noise is an issue, you might want to look at inline fans with an adjustable speed control. Or you can wire your own up (I think Dr. Penguin has an article on doing so).
Quote: Dr. Penguin Ahahaha, I only have a 4" and I know what you're talking about. I built my own fan speed controller, its really simple. Go to home depot and find the dimmer section, look for a Fan Speed Controller, this bit is important, do not use a regular dimmer as it will burn up your fan. Find a fan speed controller that says something like "optimized to reduce hum" or something about no hum that can handle the amperage of your fan (99% of them should). Next I just unplugged the fan, cut the cable in half up near the fan, stripped the wires and connected them to the fan speed controller inside an outlet box. Everything was from Home Depot and cost less than 20$. If you need any help let me know.
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