The best way to figure out which fan you want in my opinion is to watch YouTube, plenty of people out there want to compare fans for power (air flow), how much electricity they use, etc... In all the YouTube video's I poured through I never have seen a more powerful or quieter fan and it takes less electricity than anyone else was the HyperFan. When it came to finding a good quality carbon scrubber, if you are bringing in fresh air and exhausting the air through the carbon filter they say to multiple the cubic feet of the room by 3 and look for the larger Carbon Scrubber at that size or bigger (so it doesn't have to work as hard to do the job). At the end of the day really does it matter if you have someone over and they can hear your carbon scrubber turn on with that loud "HUMMMM" of moving air... and does it matter if they might get a slight whiff of cannabis being grown, and that is what should really determine how much you are willing to spend in your carbon scrubber and fan in my personal opinion.
How much does a Phat filter cost, the last one cost about $150 for 800-cfm shipped and the Hyper Fan was another $150