I'd just get a can fan that can replace your air about every 2.5 to 3 minutes you can get them off Amazon for relatively cheap just do LxWxH of your grow room to get CFM and buy one rated For your size like mine is 5x10x8 so 400cf I have a 195 CFM fan VIVOHOME 4 Inch 195CFM Plastic Round Exhaust Inline Duct Fan for Hydroponics Grow Tent Ventilation https://www.amazon.com/dp/B078HFVTYX/ref=cm_sw_r_cp_apa_i_NZ-pEb6EP86DG
I don't bother with filters on the front I feel like it's cheaper to just replace the fan every 6 months or so bc of spore build up
Parts:
195 CFM blower: $25 on Amazon
Carbon filter: $40 on Amazon
The smart outlet is a cheap one from idr where
The motion sensor is the Smartthings one
There is another one slightly more expensive with variable control which I kind of wish I would have gone with but I cheaper out lol.
I used a cheap inline fan from amazon. https://www.amazon.com/dp/B078HFVTYX/ref=cm_sw_r_apa_i_cVTREbDB3YV0E
Parts:
195 CFM blower: $25 on Amazon
Carbon filter: $40 on Amazon
The smart outlet is a cheap one from idr where
The motion sensor is the Smartthings one
The litter box is similar to this one.