Love the optimism.
Definitely many ways to go about it. From refilling an old carbon filter core to creating your own refillable filter out of PVC and attaching it to an inline fan.
Personally planning to stuff one these with carbon socks down the road. It's an inline silencer/muffler for those that don't like links ;)
Those things hanging above the tents are noise reduction modules. Here is a link:
AC Infinity Inline Duct Fan Silencer, 6" Noise Reduction Muffler Blower Silencer for Indoor Hydroponics Grow Tent Ventilation Systems https://www.amazon.com/dp/B0829F2VXP/ref=cm_sw_r_cp_api_glt_fabc_0AM0XXJ4R46ZZ49W2BY5
They do a great job reducing sound. Also that’s where the tents exhaust.