Reddit reviews VenTech IF4 4” Inline Duct Fan 190 CFM

Filter: https://www.amazon.com/dp/B005KMETHS/ref=cm_sw_r_cp_apa_N39fybPBJK5ZG

Exhaust Fan: https://www.amazon.com/dp/B005KMOJPK/ref=cm_sw_r_cp_apa_z49fyb4P1CRJ1

Intake Fans: https://www.amazon.com/dp/B009OXMZ3Y/ref=cm_sw_r_cp_apa_j59fybSC6H4BM

LED:https://www.amazon.com/dp/B00RWYCRB2/ref=cm_sw_r_cp_apa_f69fyb5RCSWEH

Bucket Adapter for PC Fans:
https://www.etsy.com/shop/HighTech3D?ref=pr_shop_more


The rest were miscellaneous things I picked up at home depot. The links above are the main parts.

Everything looks good besides the ventilation. That fan lacks the static pressure needed to pull air through a carbon filter. You need something more like this, though I recommend a quality fan if affordable. Also, you want to pull air from the top of the tent. If you pull from the bottom, you are going to have hot, stagnant air above the filter.

You'll probably be alright, but a dimmable power supply is helpful, especially in a small space.

I spent some more time today reading up on fans on some other forums. I've ruled out "booster fans" completely as it seems the only upside to those is the price. Noise and power seem to be the big trade off.

PC fans certainly are low cost and fairly quiet, but they also seem like they'll require a bit more work to get them installed in terms of adapting a square fan to round ducting/grow tent ports. They too seem to be at the low end in terms of power, and though I don't need a carbon scrubber with my current setup, it might be prudent to allow for one if required down the road...

So, now I'm leaning towards a proper centrifugal fan (eg. http://www.amazon.com/gp/aw/d/B005KMOJPK/ref=aw_2nd_sims_5?pi=SS115) along with a speed controller, as it seems they can be relatively quiet when running at lower speeds. The added benefit is that I could potentially cool a 400W HID with this fan if I decided to repurpose this little tent at some point.

Thoughts? Would a similar fan from Sunleaves (at three times the price) be significantly quieter?

This is bad ass. Doesn't use much space to boot. Model of your fan and filter?

Edit: Is this your fan? http://www.amazon.com/VenTech-Inline-Exhaust-Ventilation-Blower/dp/B005KMOJPK

You may be fine with that fan, you just need to monitor the air flow you are getting with it. If your not feeling much air exit out of your filter or if the enclosure doesn't seem to have any negative pressure you may want to upgrade. Something like this: VenTech IF4 4" Inline Duct Fan 190 CFM https://www.amazon.com/dp/B005KMOJPK/ref=cm_sw_r_sms_apa_u3rDxbFJWWDD1

I use the 6" version

4 inches of power


This is what you are looking for.

Going to be in a small ish closet in a room thats partially underground. I live in west side washington state if that gives you a general sense of climate, roughly 60 F ambient temp inside said room. It has a window that can be opened for fresh air, average temp in the summer is about 70F. If i run [this fan from amazon] (http://www.amazon.com/gp/aw/d/B005KMOJPK/ref=mp_s_a_1_1?qid=1458783951&sr=8-1&pi=SY200_QL40&keywords=50+CFM+inline+fan&dpPl=1&dpID=51xL2qyZJAL&ref=plSrch) with the fan control in the frequently bought together section below will that give me the range of speeds i need?

Passive isn't enough for me but might be for you if you can keep temps under 78. I have two of these, each with a controller. Without the controller they run on full which is loud and unnecessary most of the time. I started with only one but couldn't get the heat down enough. I also wanted to eliminate the possibility of mites/dust/bugs coming into my passive intake. Tent is 2x3x6 with roleadro led and timber cob light. I have a phresh filter on the Intake and a phresh scrubber inside for exhaust. No bugs or dust coming in, and no smell coming out.

https://www.amazon.com/VenTech-IF4-Inline-Duct-Fan/dp/B005KMOJPK

No, pretty quiet IMO. It's no louder then the inline pump. I use this fan. It required a little bit of silicon to plug places where water was dripping out. I did drill a hole in the bottom of the fan to let any resting water out.

Hm that makes sense. I got the one that's recommended in the starter guides. this one

The duct work isn't very long. Only a few feet after the fan. I'd rather not extend it much for space reasons, and also I think it would reduce air flow to have more length.

Thank you very much, I think I will go with the brake drum forge. I found a decent set of instructions here: http://www.instructables.com/id/Brake-drum-blacksmithing-forge/?ALLSTEPS, although I still might use fire bricks instead of the cement ones they used. I don't know much about centrifuge fans, and google wasn't especially helpful, do you think this centrifuge fan would be adequate? http://www.amazon.com/VenTech-IF4-Inline-Duct-Fan/dp/B005KMOJPK/ref=sr_1_3?ie=UTF8&qid=1409761541&sr=8-3&keywords=centrifugal+fan

Thanks again for your insight

I run my filter blower at night that vents the light out via a cool tube, but I only run the intake during the light hours. I use two of these blowers in the link below, once set for intake and the other does outake

http://www.amazon.com/VenTech-IF4-Inline-Duct-Fan/dp/B005KMOJPK/ref=sr_1_1?ie=UTF8&qid=1398191541&sr=8-1&keywords=4+inch+blower+fan

>Can you explain your buckets air flow and air filtration?

My bucket has two passive 120mm intakes that are covered with mesh filters and a single 120mm exhaust in the lid that connects to a 4" flange with dryer ducting. There is a 4" 190 CFM In-Line fan connected to a 4x12 Carbon Filter. I also have a variable fan controller on the in-line fan. I run mine at about half power.

>What do you have your plant in? Planter and soil on the bottom of bucket ect?

I use a 5g nursery pot. For my next grow I will be switching to a smart pot to avoid it getting rootbound.

>I was thinking of extending a 5g bucket under the brute can so the soil is under the setup and the plant itself is in the brute only allowing more space to grow.

If you're gonna do that you're better off getting one of those 5g DWC setups. With that said, I'd advise against doing that. Reason being is you add another layer of complexity in that you have to figure out how to support the brute and you run risks with light leaks. This also puts the brute much higher than you are which can make servicing/watering awkward.

I just have mine sitting on the bottom of the bucket in the pot. The newer style Brutes cause you to lose a few inches but if you can budget to buy two of them and use one as a spacer, it works well.

>Would that work or would I have an issue with temperature difference between roots and plant?

I am not experienced enough to say yay or nay but I doubt it?

I would stick with using a fan. The trick is you cannot just put a computer fan blowing upwards into some insulated tubing. Think of blowing into a 12' pipe with a cap on the end; the air needs somewhere to go or it will not flow. You need to use a centrifugal fan (like this) in your keezer and figure out a way to attach it to smaller tubing (probably 1"ish in diameter) and run the tubing up to your beer tower in the kitchen. This way the cold air is blowing out at the top of your beer lines and will circulate back down into the keezer. If you try this with a normal computer fan it will not work; they are very low pressure but high cfm. Since your fan will be acting more like an air pump than a fan it needs to be a powerful centrifugal fan (higher pressure) or their will not be enough air pressure to travel through a 12' tube.