RE: your initial post - 1x-2x your space in cubic feet, per minute, is a good range of exhaust for most growers and you have to be massively cranking the exhaust to truly create harmful conditions, so you have a fairly wide range for an acceptable exchange rate. Some can get by using even a lower exchange rate of 0.25 and 0.5 your space per minute. Dialing in your preferred exhaust rate is even less of an issue if you have an adjustable exhaust that can cover 0.25x - 2x your space per minute. If issues with your exhaust rate occur, adjust it to higher or lower rates, as needed.
You state your tent is 5x5x7, so that's 175 cubic feet. 100cfm would be on the low end and might not be enough. 400cfm would be better, giving you two exchanges per minute. Getting something in the 700cfm range would allow you greater control and make adjusting to 2x exchange rate easier on the fan's motor. If you are using a carbon scrubber, that will impede the exhaust rate from 10%-30%, so take that into account if you are using a carbon scrubber.
I use the
AC Infinity S4 (4" exhaust) at 25%-50% in my 2' x 2.5' x 7.5' flowering cabinet and have two passive 4" intakes. Works great and is very quiet. It can go up to 205cfm, which is nearly 5.5x the space of my cabinet per minute! For your needs, the
AC Infinity S6/T6 would likely be best, with a max cfm of 402, which would be 2.3 exchanges per minute or the a6 series with max cfm of 352cfm, which is exactly 2x your space. The S8/T8 has 807 max cfm, giving you up to 4.6 exchanges per minute. This also means you could run the S/T8 at 50% and exchange your tent twice every minute and it would likely operate more quietly than the S/T6 at max, worth considering if noise is an issue for you.
I don't find any of the features for the T series (smart controller) models' features to be very useful. You don't really want your exhaust only triggering when humidity or temp gets too high; you want it running all the time. They could be useful as a secondary exhaust to help control conditions, but there is no need for it as a primary exhaust. The A-series are the T-series with a lower cfm.
I have never found the need for active intake for the smaller grows that I and most hobbyists run and balancing the intake/outtake seems unnecessary for most hobbyist systems. It's another point of failure to contend with and the less points of failure you can deal with, the easier everything will be. I find circulatory air to be much more important, especially down by the medium. For soil and coco, dampness invites fungal growth and fungal gnats. For hydro, it's really easy for mold to build around the base and especially so if you use foam pucks.
For my flowering chamber, I have 2x 6" fans blowing down onto the canopy and 1x 6" fan constantly blowing at the the base stem where it comes out of my DWC tote. For my mother/clone chamber, which is only 4' tall, I have 2x 6" fans blowing across the pots of soil to discourage fungus and gnats and nothing blowing on top of the canopy.
