Ventilation Questions

Alright, so the tent I have is a Secret Jardin Darkstreet DS120W (2' x 4' x 5'4"). It's ports are 6". I plan on doing a 3 plant SCROG.

I followed a CFM calculation online factoring in I live in a hot climate, will be using a odor scrubber, and the volume of my tent. The CFM I ended up with is well under 100. The inline fans I'm finding are all over 100 CFM.

With that out of the way, I have a few questions.

1) If the exhaust's CFM rating is too high, will this have an adverse effect on my grow? If so, what would be the recommended rating I go for?

2) Given that I have a pet cat and dog, I'd like to have an active intake so that I can have a pre filter that will help keep pests, dust, pet hair, etc. out of my grow tent. Any suggestions?

3) And lastly, if I go with an active intake, how will that affect what I choose for my exhaust fan? I've read that you'd want one port to be smaller than the other, but on this tent both ports are the same diameter.

Once again, thanks to everyone for helping! I look forward to posting my first grow ever within a couple weeks.

As lomng as ypou don't wind-burn the plants, ypou can NEVER move too much air. A plants uses all the air around its leaf in 5 minutes. It also keeps the stomata clear.
2. I made one. Steel mesh rolled into a 6 inch cylinder. Stove pipe end cap. Secured with hose clamps. Stretch (3) nylon stockings over it. Voilà filter.

3 run the passive intake 50 cfm less than the exhaust. That keeps negative pressure and ALL that intake air goes out through the filter

It would be a good idea to get speed controlled fans OR put variable controllers on the fans so you can tweak the flow. Tents can be tricky sometimes, if the intake is too strong it blows up like a balloon and if the exhaust is too strong the sides suck in and you lose space.
I use a Dust Shroom for my intake filter, it works well. Just be sure to put your intake filter before the intake fan so it pulls air through the filter.