[slaine87]

Thanks for clarifying that. Vivosun did not mention the cfm number for their filters, which is a bit odd. I didn't know the filter had to be of a higher cfm than the fan though.

One friend told me I could also connect the 6 inch filter to the exhaust duct which would then filter the air a second time and push it back into the room. I don't know if the fan would be strong enough to push through it or if it would strain the fan's motor considerably...

By the way, my room is 11 foot x 11 x 8, so that's about 3.5m x 3.5m x 2.5m or 30.6 cubic meters.

[FakeSunGrower]

Hey bud I’d like to chime in on your ordeal , how about making an air scrubber with the 6 inch filter ? That should take car of any runaway stink , good luck , FSG

[RiddleMeThis]

hyperfan and phresh filter - i sized up to run at lower power = quieter. Like someone above said, oscillating fan is louder than the exhaust fan

[Easy7]

4" filter > 4" phat mini muffler > 4" vortex hooked to speed controller > 4" phat mini muffler > 4" duct exhaust.

Muffler will cost about $100 for two, cuts sound in half.

[stim]

like easy just said they make silencers for your fan. google fan silencer/muffler.

[Easy7]

To go further, the fan can be wrapped in sound absorbing material. Amazon has lot's of options for those.

Mufflers on both ends of the fan, sound absorbing material wrapped fan and a speed controller would be super duper quiet.

It's one thing for someone to see grow tents. Totally different to hear the fans. Tents can look like storage closets for clothes or something if quiet.

[Sarcclash]

Odor IS a major consideration. Carbon filter(oversized)> Vaportek > and a roomsize capable solid state ionizer down stream of that.

[Spaventa]

First throw away the HPS and MH and get a 315 CMH - you will only need 200 CFM air exchange so a 4" exhaust fan and passive intake will do, rather than a 5 or 6" exhaust fan and 4" intake fan. The savings on fans, filters, ducting and controller will almost pay for the CMH which is waaaaaaay better in every way than a 400 HPS - yield and quality go up, temps come down. Don't buy an expensive ventilation system just to run inefficient, outdated lighting that requires it because modern efficient lighting does not need half the cooling.

Your exact requirement depends on your climate where you are so google "grow room ventilation calculator" will allow you confirm the exact CFM you need.

Fan noise - there are two sources. The motor and fan bearings or the roar/woosh of air moving. An enclosed fan and acoustic ducting will make a 4" 200CFM setup virtually silent running.

Brushless fans like hyperfan etc need digital fan controllers for automation. A 6" digital, silenced fan with controller is more than twice the price of a conventional fan and analog controller. all you get is some energy saving. The fan would need to be used for a few years for the savings to justify the extra cost of digital and most likely it would be superseded before then anyway. Unless you have money to burn, conventional fans and controllers are still more cost effective overall.

[slaine87]

Originally Posted by FakeSunGrower

Hey bud I’d like to chime in on your ordeal , how about making an air scrubber with the 6 inch filter ? That should take car of any runaway stink , good luck , FSG

That's exactly what I ended up doing; no smell whatsoever now, at least as long as I do not open the tent! Quite happy about this... So it goes 4 inch CF --> S-Line 6'' fan ---> 6'' CF. I can't post pictures but damnnn I'm pretty sure my v-scrog is doing great for a first timer!

As for the other suggestions, thanks all I will look into that, especially soundproofing the ducts and the fan itself. I probably won't use my grow tent this summer, temps would just skyrocket in my bedroom. However I'll use this spare time to insulate the ducting and the fan itself, like Easy7 suggests.

@Spaventa

My supplies are already bought, but I'll look into that. Never heard of CMH man, def curious about that *opens new tab*

peace

[Slackerbri]

Thank you, thank you, thank you, thank you.

I've got a serious noise issue right now that was going to be an issue, I can cut that down now.

Much appreciated.

Originally Posted by stewart169

S&P Silent series. I have one in my tent and my oscillating fan in the tent makes more noise.

https://www.solerpalau-usa.com/products.html

Not cheap but if you want quiet worth it.

I have read some suggestions of a couple other brands but they have the same look of design. The squirrel cage type fans all make a lot more noise. Also using a speed control on a fan that isnt a true multi speed fan will increase the noise. YouTube S&P.

Phresh filters seem to have a good rep and following. I have one and keep it about a year and replace. Im sure there are others.