This is my kitty litter Air Scrubber(*Check DIY Air scrubber) attached to my flowering grow cab.
It's a heavy-duty 120mm fan(120v,275cfm) that I bought on ebay for $20(includes shipping & handling)
I modified little so that I can attach a 4" dryer vent.
There is a 100cfm 120mm Antec PC fan and it's part of my 2-fan exhaust system for flowering grow cab.


My air intake system provides fresh air for 24 hours..
Yesterday was hot.. Really hot.. Outside temp went up to 80°F and average temp was 68°F during day time. Temp inside my grow cab went above 90°F..
I attached the intake part to my air conditioner and had turned it on to keep temperature low (Average 70°F ~ 72°F) for all day..