Reddit mentions of Active Air 6 inch 400 CFM Inline Duct Fan, Growers House 6" Carbon Filter and 1 Pre-Filter | Free 25 Feet Lightproof Ducting and Active Air Controller Combo for Quiet Grow Tent Ventilation

Solid research so far. Yeah, don't buy a blurple. You picked out good lights from Alibaba and Vivosun makes good tents. Most indoor growers in most climates need a dehumidifier. You can wait to see what your RH does once your plants are vegged out before you drop money on one if you like. But you should budget a couple hundred bucks for a good quality 70 pint dehumidifier because you will probably need one. You may also need an AC unit if you don't already have that. You may need a humidifier. As far as the choice between the 4x4 or 5x5- Don't forget to take available power into consideration. Lights, dehumidifiers and air conditioners all draw a lot of power. You might need multiple circuits to power all of that.

Active Air makes a 6" blower that is head-and-shoulders above the plastic Vivosun and Ipower blowers.

You are off to a good start with GH Flora Trio and Fox Farms soil. I'd suggest you add CaliMagic, Armour Si, and Grower's Recharge to your shopping list.

I would do four plants in 7 gallon pots for a first run. That will work in a 4x4 or 5x5.

Unassembled QBs can be a little intimidating if you have no electrical experience. If you hook something up wrong and turn it on, you can instantly fry it. I don't have any experience with the pre-assembled ones, but it sounds like a safer option.

Auto-flowers are fantastic in certain circumstances, but I'm not sure that they're right for you. I would go with photo-period plants. You have more control, you can do more training, you can recover from mistakes in veg, and you can veg your plants right to the limit before flipping to get a great yield.

$1000 is not a large budget for a well equipped 4x4. $1500 is more realistic, TBH. Climate control equipment is pricey, then you get nickel-dimed by your meters, fans, chemicals, sprayers, pots, etc. Just keeping it real. Where I live weed cost $350/ounce. I made my investment back X 2 on my first grow. Good luck!

After more research im looking at

For Veg I will get a 2x2x4.5 tent Topo grow kit https://www.amazon.com/gp/aw/d/B075KCL71M/ref=ox_sc_act_image_7?smid=A1CLX3M21C6YH2&psc=1

I plan to run a CMH at 4200k (Phillips).

For flower I will get a 3x3x7 ( I’d increase to 8) https://www.amazon.com/gp/aw/d/B014263RJI/ref=ox_sc_act_image_11?smid=ATVPDKIKX0DER&psc=1

I plan to run a CMH at 3100k (Phillips)

Air pump for the DWC ( I would one for each tent)

I found - https://www.amazon.com/gp/aw/d/B06XDKRYC6/ref=ox_sc_act_image_9?smid=A2PQGFJXAT8J9K&psc=1

For circulation I found ( I would buy one for each tent)

https://www.amazon.com/gp/aw/d/B078SXNJ21/ref=ox_sc_act_image_6?smid=A3OJY9E0ZY1FCH&psc=1

And would add two of these fans into each tent

https://www.amazon.com/gp/aw/d/B000U9V47E/ref=ox_sc_act_image_2?smid=ATVPDKIKX0DER&psc=1

Have a basic titan mechanical timer ( 2 of them) 4 vivosun air stones 4x2 2 Digital humidity / temp reader 4 - 5gal buckets

Any concerns ? Thus far purchase is at $1600

https://www.amazon.com/gp/product/B078SXNJ21/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

my exhaust fan up top. mounted the carbon filter inside, fan outside. two small fans on the sides, and one larger fan close to an open port in the back where no light shines on the outside. I'll test it tomorrow as I'm still out for work. I know about making it a negative pressure area thankfully. Both lights come with dimmers. Fan comes with speed control, and 400CFM.

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What I meant by pumping air in, would simply be the smaller ones close to the ground next to an open exhaust hole. Again, I'm quite horrid at descriptions, but I think I've done my homework. Just nervous & excited. If you can't tell, one of the main reasons I will grow is anxiety. Thanks for looking out!