phresh filter and fan ?

[JimmyRow]

Its time for me to get some more odor control, and I have a quick? regarding filter cfm v. fan cfm.

I'm running a 8x8x7 tent w/4800w. And planning on going w/phresh filters, I like the overall package, performance, price, and weight, v. Can filters.

Here's my ? I want to get max odor control, and exhaust. I plan on going w/ 8" fan @745 cfm. And 8" x 39" phresh filter rated at 950 cfm. My thoughts the filter will easily handle the air from the fan and move slowly through the filter allowing plenty of exposure to the carbon. I felt pretty good about my decision until the guy at the hydro store told me I wanted more cfm in my fan than filter. IMO that seems like it would overload the filter and allow some of the stench out.

Any thoughts? Thanks for any input. -JR

 

[Kit Kat]

I agree with you on the Phresh filters. I'm still using the first 6" I bought several years ago and have moved on to larger ones, as well as their duct mufflers and been happy with the build and performance of them all.

Your hydro store guy is wrong, you want the filter rated for a higher CFM flow than what the fan can do. Your scenario of using a 8" @ 745cfm on a 8"x39" rated at 950cfm is fine.

The only issue is 745cfm of exhaust in an 8x8x7 tent only gives you .6 exchanges a minute (and more like .4 after hooking up the scrubber and duct work). Sizing up to a larger fan (even if you have to use a reducer) may be better?

 

[JimmyRow]

Kitkat- thanks for the confirmation. As far as air exchange I'm only running my filter currently about 1/3 of the time to keep temps and humidity up. I'm also running a 6" fan on my lights 12/hrs a day heating another room.

 

[Kit Kat]

Oh gotcha. You're totally set then, if you keep that sizing combo the same it'll last a long long time. I used a way oversized 6" when I first started, pushing and pulling and later as a cigarette filter in the garage and that sucker is still goin' strong.

 

[JimmyRow]

Oh gotcha. You're totally set then, if you keep that sizing combo the same it'll last a long long time. I used a way oversized 6" when I first started, pushing and pulling and later as a cigarette filter in the garage and that sucker is still goin' strong.

Nice, I want to bring my 4" fan and filter in so I don't have to go to the garage to smoke bowls, then my wife can't bitch about the smell.
Thanks for your help- I wanted a second opinion before I ordered(amazon $330 for 8" fan and 8 x 39" phresh filter,delivered, that's $125 less than the local shop)
All about supporting the small local people, been one, but sometimes I just can't justify.

Do you feel like the mufflers are worth the investment. Gonna have to do something when I add the 8". Already sounds like my garage is about to take off.

 

[Kit Kat]

Totally understand on the local aspect, maybe go in and see if they'll price match? I've done that a couple times with a local store and while they haven't always given me the exact price, its been made worth my while anyways.

As for mufflers... I'll never not use mufflers again. I was building my own (tons of DIY steps and I did a writeup in my 600w Kalichakra failure) but I picked up an 8"x24" muffler during a black friday sale on a good deal and it works fantastic. Much shorter and lighter than the general DIY ones. Someone else posted (I'll see if I can find it later) that the acoustic foam the mufflers use only last five years vs bonded glass types (I believe it was bonded glass?) but five years seems like a pretty good investment for $50-$100 and it makes a huge difference.

Here's what my 8" looks like hanging in a tent:


And here's one I built myself and later stuck on the fan for the smoke spot so it wasn't so irritating:


And a shot of the 6"x24" that replaced the monstrosity above:

 

[JimmyRow]

Thanks for the pics, I'm with you on the five year lifespan. Id be willing to bet this technology will evolve in the next five years anyhow.
I've done some research on DIY mufflers, and seems to still be an investment, considering whats available. Glad to know they work too.

 

[TribalSeeds]

An 8" filter is gonna be pretty heavy for a tent if youre using hoods in there.

 

[farmari]

You can use a Phresh filter with a fan of the same cfm rating, but it's better to get a larger one. (of course cost, weight, and space has to be considered) You'll get more actual cfm with a larger filter because it will put less static pressure on the fan, and the filter will last longer as well. In my current setup my Phresh filter has a cfm rating over 2x higher than the exhaust fan cfm... working great so far.

EDIT: I don't know the advertised rating methodology! I said: "With Phresh filters, the advertised rating is for 'scrubbing', not exhausting." But when looking online I realized that I was thinking of a different brand of carbon filter, and based on the Phresh weight to cfm ratio and complaints of short lifespan presumed it to be true of Phresh as well. Sorry everyone

 

[JimmyRow]

An 8" filter is gonna be pretty heavy for a tent if youre using hoods in there.

8x39 phresh weighs in at less than 40#s. I've got two dedicated rods to hang the filter. I had a can 50 hanging in my 10x10 for years (that filter weighs in over 50#s). The structures still good, but all of the zippers are busted.

Plus. These grow lab tents are pretty sturdy, only the zippers leak light bad

 

[TribalSeeds]

Good to know. Im probably gonna need to upgrade my filter size and was worried about it being to heavy for my tent with my blockbusters in there.
The 6" didnt cause any extra sag or anything, but the hydro store dudes told me an 8" would probably collapse my tent.

 

[johnipedestran]

With Phresh filters, the advertised rating is for 'scrubbing', not exhausting. You can use a Phresh filter with a fan of the same cfm rating, but it's better to get a larger one. (of course cost, weight, and space has to be considered) You'll get more actual cfm with a larger filter because it will put less static pressure on the fan, and the filter will last longer as well. In my current setup my Phresh filter has a cfm rating over 2x higher than the exhaust fan cfm... working great so far.

Solid advice....my hydro guy tried to tell me that the 10inch phresh I was buying would "crush" my vortex 600. Needless to say the fan is still kicking and the filter is too. I plan to replace filter next year. That was almost three years ago...

peace
jip

 

[JimmyRow]

With Phresh filters, the advertised rating is for 'scrubbing', not exhausting. You can use a Phresh filter with a fan of the same cfm rating, but it's better to get a larger one. (of course cost, weight, and space has to be considered) You'll get more actual cfm with a larger filter because it will put less static pressure on the fan, and the filter will last longer as well. In my current setup my Phresh filter has a cfm rating over 2x higher than the exhaust fan cfm... working great so far.

Good to know thanks. I just didn't agree with what the guy at the hydro store told me. I appreciate input.

TS-I hope to have the 8x39 hung by next week. I'll let you know if we collapse.

 

[Fly by Night]

I'm running a 8x8x7 tent w/4800w

Most I ever vented with an 8in vortex successfully is 2400w, for 4k hps I use a 12in fan/filter (vortex/profilter). Anyway I'm pleased with the results, dangling bare bulbs. I'd hate to be underblown homie! Peace

 

[Kit Kat]

With Phresh filters, the advertised rating is for 'scrubbing', not exhausting.

This is great to know... I sent a couple emails asking this, and static pressure ratings, and never got a response. Thanks!

Good to know. Im probably gonna need to upgrade my filter size and was worried about it being to heavy for my tent with my blockbusters in there.
The 6" didnt cause any extra sag or anything, but the hydro store dudes told me an 8" would probably collapse my tent.

I hung my 8x24 with a Magnum XXXL 8" in a 5x5 Growlab, and later with two XXXLs in a 5x10 and while the bars sagged a little it never seemed to be a problem.

 

[JimmyRow]

Most I ever vented with an 8in vortex successfully is 2400w, for 4k hps I use a 12in fan/filter (vortex/profilter). Anyway I'm pleased with the results, dangling bare bulbs. I'd hate to be underblown homie! Peace

Thanks for the advice, but I'm currently running a 6" vortex and a 6" booster on 4k, and its perfect, I've got 2 non vented 400w hoods running cmh, I've got another 6" booster bringin cold air into the tent, and 200cfm 4"fan/filter for odor control/exhaust @15 min /hour.
But I'm finishing stretch and looking to drop my RH a bit, I've been able to keep it up around 65%, so I plan on using the using the 8" fan /filter simply for odor control aand air exchange. It took some play in with but I've got everything how I like it.
Note-it was-5 here this morning and very low RH. I

 

[farmari]

This is great to know... I sent a couple emails asking this, and static pressure ratings, and never got a response. Thanks!

Kit Kat sorry I was wrong! Reading that made me recheck where I thought I found that info and I was wrong. When looking online I realized that I was thinking of a different brand of carbon filter, and based on the Phresh weight to cfm ratio and complaints of short lifespan presumed the 'scrubbing cfm = rated cfm' to be true of Phresh as well. Sorry everyone

 

[eyes]

jimmi,. those rating of the filter you are listing is more like 450 cfm. make sure there not talking bout recirculation-which they usually dont tell ya. Can rates the filters with both numbers. I bet youd be better off with a Can. thicker carbon bed and a few members i know rave bout em. most likely youll need a scent cover-up as well unless you run the filter 24/7 which youll beat it out in 60 days. i find 12-15 lbs last 45 days or so.dont believe the hype bout 1.5-2yrs on the phresh. maybe a 150 lb can-yeah. that filter probably has 33 lbs of carbon in it. id give it 1-2 rounds. stinkier strains will have it kod in 1.

I went out and bought a mt air. i was told it will last 6 months by a member. He was right.

 

[Hammerhead]

Depending on how you use the filter will determine how much CFM you need.. Example in my case to use it as recirculating scrubber 840 CFM is my max. If I use it as a exhaust filter 420 cfm is my max..Im using the 50 as a recirc filter it's getting 400 cfm this is working no smell in the room. I can increase the CFM if I need to.

I have a 9000( 1 year still works) that im using as a exhaust filter. The 4" in line is 165 cfm at the head so im getting around 140cfm. the 9000 is rated at 120 rec/55 exh. I have it on a speed controller. I cant measure the CFM so im guessing its at 80cfm thats more then the 55 max. If I lower it anymore I will lose my neg pressure. This combo Im using is working great no smell anywhere even in the flower room. I have a 33 for the veg room

Anyway my point is we cant just put any fan on the scrubber it needs to have the right CFM for the type of install its being used for.

 

[JimmyRow]

eyes-good info, I appreciate it. I've used can filters before. And have no complaints. They work great! But...I'm also satisfied with the performance of my 4" phresh thus far. I know there is a lot of knowledge and exp. on icmag, but I know a handful of guys up here using phresh all with great reviews. Also my rooms gone way over budget, so...I'm gonna take the risk on the phresh, and if I get 9/ months of service, mission accomplished. And if it doesn't work, I'll go back to can. Thanks again!

HH- had to put the bowl down, a lot going on there! I like it. After I read thru it a couple times. I loaded up some Bruce banner, got the note pad out gonna have to do some thinking on my configuration. Damn, I thought I had it locked down. Thanks for sharing! Good stuff.

Here's what I've come up with. I'm going to have to reseal my lights to reduce positive pressure. Push that air thru my 4" filter until I can put a 6" on the end. Move the 4" fan to the veg room to blow warm air on my roots, flip flop that fan with the 8" fan filter combo set to run 30 min/hour. I have a speed controller here too, so I may have to play with fan speed somewhere.

Let me know what you think. BTW. I know you think I should go w/can. And they do have a proven track record, but I think I'm gonna roll the dice!

Thanks again for all the input-JR