Reddit mentions of VenTech 440 CFM 6" inch Inline Exhaust Blower Fan with Carbon Filter and Variable Speed Controller

Lights: I have the mars hydro 300 (132 true watts) as my main light on the top, and plan to add a couple strips for side lighting in the near future.

Ventilation: As you may see from the pictures, I have the heat exhaust on the top side. The exhaust is being pulled into a secondary tote. In the secondary tote I have a large carbon filter attached to a 6 inch inline fan with variable speed control. This kit. Definitely overkill but I like the room for expansion.

I plan to start growing in a 3 gallon smart pot knock off, with some ak-48 autoflower seeds.

I have really enjoyed watching this community grow through the years.

Thank you everyone for your wonderful contributions. Guys like /u/Ekrof, SAG, /u/Halfmpty, /u/exactly25smeckles, and the rest have really inspired me to try this for myself.

I would like to add some filtration to my passive intake, any suggestions?

VenTech VT IF6+CF6-B Inline Exhaust Blower Fan with Carbon Filter and Variable Speed Controller, 440 CFM, 6" https://www.amazon.com/dp/B0051HDECS/ref=cm_sw_r_cp_apa_.cj4xb40DD9M8

So this combo should work? It's 6 inches duct at 440cfm.

You should only need an exhaust. I would recommend a 6" centrifugal inline fan.

Here is the combo I used when starting out

And here is what I am using now

That's a lot of money for a fan. You could always get a cheaper fan that moves more cfm and simply get a fan silencer. You would still save money at that rate and spend the rest on an enclosed hood or cool tube to help with temperature control.

Overall you're good.

Fan Silencer (out of stock at the moment, but cheaper): http://www.amazon.com/VenTech-VT-FS-6-Muffler-Silencer/dp/B00HWILBSS/ref=sr_1_3?ie=UTF8&qid=1450225496&sr=8-3&keywords=fan+silencer

Fan silencer (more expensive, but in stock): http://www.amazon.com/Phresh-701200-Silencer-4-Inch-12-Inch/dp/B007ZU5YQS/ref=sr_1_6?ie=UTF8&qid=1450225496&sr=8-6&keywords=fan+silencer

Hood Upgrade: http://www.amazon.com/Apollo-Horticulture-GLRLS24-Hydroponic-Reflector/dp/B00BMVK8HG/ref=sr_1_1?ie=UTF8&qid=1450225652&sr=8-1&keywords=air+cooled+hood

Fan and Carbon Scrubber Replacements: http://www.amazon.com/VenTech-VT-IF6-CF6-B-Controller/dp/B0051HDECS/ref=sr_1_1?ie=UTF8&qid=1450225799&sr=8-1&keywords=ventech+vt+if6

If you're going to be flowering in the tent, I would recommend lightproofing it, as well. Use only the ports in your tent for intake and cut some carbon filters to size. http://www.amazon.com/Carbon-Pre-Filter-38002-Activated-Sheets/dp/B00LXIWNT4/ref=sr_1_1?ie=UTF8&qid=1450225982&sr=8-1&keywords=carbon+filter+sheet

Your tent is a little expensive, too. If that's the one you have your heart set on, go for it. As an alternative, I suggest http://www.amazon.com/MILLIARD-Reflective-Hydroponic-Mylar-Window/dp/B00ETBDX14/ref=sr_1_1?ie=UTF8&qid=1450226158&sr=8-1&keywords=milliard+grow+tent

You will want a fan or two of some kind to circulate air inside the tent. 6 Inch clip fans are popular. I use a pair of 4 inch clip fans and a tower fan.

Make sure to look into a DIY Ona Bucket for smells. During flower it will stink up your room when you open the tent. Just turn the Ona bucket on a little before that and you're good. If you're really paranoid about smell, you can also get an inline carbon scrubber. They're pretty expensive and probably not necessary unless you pick some especially fragrant strains. http://www.amazon.com/Phresh-500-Inline-Filter-6-Inch/dp/B00CJIMUH2/ref=sr_1_1?ie=UTF8&qid=1450226390&sr=8-1&keywords=phresh+inline

That's my $.02, anyway. There are much more experienced growers here.

hell yeah. There are activated carbon air scrubbers that you can even make on your own. Essentially all it needs to do is pass air through the filter. You can pick up activated carbon at pet stores. They sell it for fish tanks. Youtube has all kinds of DIY instructions for building an air scrubber.

If you have the money and don't feel like getting creative with some lowes buckets and a house fan though, you can get whole kits at amazon. Now keep in mind, the one I linked to is pretty nice, but you still need to get the duct tubing and if heat is an issue in your grow area, you'll most likely use this as an exhaust, but from what I've read they are your best solution.

https://www.amazon.com/VenTech-VT-IF6-CF6-B-Controller/dp/B0051HDECS/ref=as_li_ss_tl?ie=UTF8&qid=1462551273&sr=8-9&keywords=inline+fan&refinements=p_85:2470955011&linkCode=sl1&tag=christieheavy-20&linkId=8ba551246f14af8ea4691eed28b8cd45

That's the one I'm looking at getting. Or here is a website that has good reviews on other ones.

http://heavy.com/garden/2016/05/best-inline-duct-fan-grow-room-how-to-cannabis-weed-marijuana/

I just posted a few pics of my second grow. I use a 440 CFM carbon fiber scrubber. The physical carbon scrubber is mounted inside at the top of the tent. I'm running 6 inch duct which is a bit extreme because my tent is 2x4x5. So, the scrubber is mounted, with a six inch duct from there, leading into my air cooled hood. Another six inch duct runs out of the hood and up towards the ceiling of the tent where it goes into the intake fan and led away from the tent.

Before I had an air cooled hood and carbon fiber scrubber (my first grow), I was constantly battling heat issues with a 400w light. I had two six inch inline fans, one bringing in fresh air and one pulling hot air from the top. Then I had two cooling fans inside the tent to move the air around the tent. It was crowded with four plants that stretched because I didn't have a proper cooling system. Average temps where mid, to high, 80s (26°+ c). In the end I made out okay with no problems 5.2oz with no stress training.

Here's my scrubber It's huge, but I don't need any other fans except the two blowing on my girls to strengthen their stems and roots. Just a thought.

I would just get a fan / filter combo like this - VenTech VT IF6+CF6-B Inline Exhaust Blower Fan with Carbon Filter and Variable Speed Controller, 440 CFM, 6" https://www.amazon.com/dp/B0051HDECS/ref=cm_sw_r_cp_api_qURgzbNF9GVP3

Extra plants don't necessarily equate to more yield if they are fighting for space and light.

https://www.amazon.com/gp/aw/d/B0051HDECS/ref=yo_ii_img?ie=UTF8&psc=1
Not using this carbon filter however, I am using a phresh 6 inch inline scrubber 500 cfm

I bought this kit and it is more than enough for my 3x3 tent with 600w light:

http://www.amazon.com/gp/aw/d/B0051HDECS/ref=mp_s_a_1_2?qid=1450214704&sr=8-2&pi=SY200_QL40&keywords=ventech+6+inch+inline+fan&dpPl=1&dpID=51lFVy2sSVL&ref=plSrch

My tent has intake flaps on the sides along the bottom and they seem to work well

So I recently added this fan & filter combo, which I must say was MUCH larger than I had anticipated, and has had an immediate effect on my RH. I went from about 35% to around 16% in a couple hours. Shortly after, my flowering plants are showing twisted and drooping leaves. Can this be the cause?

The Aussie Blues is 90% Sativa and already had drooping leaves closest to the flower, but no twisting. Note that the plant looks healthy otherwise, all the leaves have a nice even color and are perky. Do certain strains look like this when flowering?

Also it is growing a lot of popcorn, should I trim this off before it develops more?

Thanks for the input, guys.

https://www.amazon.com/gp/aw/d/B0051HDECS/ref=mp_s_a_1_4?ie=UTF8&qid=1484254597&sr=8-4&pi=AC_SX236_SY340_FMwebp_QL65&keywords=carbon+filter&dpPl=1&dpID=51lFVy2sSVL&ref=plSrch

I don't think I got that exact filter but the fan and controller are the same. Besides that you just need some flex duct and 2- 6" clamps.

I popped my seedlings under the light, great for the warmth, and they immediately have light when they pop. As far as carbon filters, you can have one in your tent and blow it directly into your room, no need to blow outside. I recommend this : https://www.amazon.com/gp/product/B0051HDECS/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 very well priced,and includes carbon filter and speed controller for smaller setups. I have no experience growing without a carbon filter/ passive intake, but i can imagine without air flow(stale air), you may not have enough fresh air (specifically carbon dioxide) to grow properly Good luck!

I use this: http://www.amazon.com/dp/B0051HDECS/ref=pe_175190_21431760_cs_sce_3p_dp_1

my tent is 4x4x7

600w hps with a fan and filter. you're going to want a fan and filter regardless of the lights you use, and the 600 hps will beat those two panels at a fraction of the cost. just duct the exhausted air out of a window and you won't be running much hotter than the leds.
if you're dead-set on led, look into cobs or go with a couple cheaper panels imo. maybe a couple of these. the ones you linked are really expensive and aren't going to be enough light for that 4x4 tent.