Pushing a rubber maid.
- Thread starter Mr. Tony
- Start date
G
guest 77721
Go for it!!!
My only concern is that the fan+scrubber needs to pass more than 80 CFM for the 250 HPS.
My only concern is that the fan+scrubber needs to pass more than 80 CFM for the 250 HPS.
My 76 CFM axial surely couldn't do the job. I use the TD 100x with my 250 CMH. At the lower setting (100 cfm) it struggles. Because of stealth noise issues, I rebuilt my DIY scrubber with a 1/2" carbon bed rather than the original 1". You can't rebuild a canfan in that way so, consider using the higher 135 cfm setting if you have temp issues.
G
guest 77721
Hey Freezerboy,
have you ever figured out your effective airflow using this chart?
All ya hafta do is measure the ambient and exhaust temps. Use that delta T and the light wattage to determine the effective CFM.
I'm wondering if you could simulate this setup to see what Mr Tony's temps would end up at.
have you ever figured out your effective airflow using this chart?
All ya hafta do is measure the ambient and exhaust temps. Use that delta T and the light wattage to determine the effective CFM.
I'm wondering if you could simulate this setup to see what Mr Tony's temps would end up at.
Red, thanks for watching out for all of us and all your hard work.
That was the chart I used. What I didn't know was, much as I LOVE my mixed vent S&P, it simply does NOT suck like a centrifugal such as Vortex which, I suspect, was the type of fan used to make the chart. I've since taken to suggesting that prospective S&P buyers go one fan up from their "need."
Those unfamiliar with red's Ventilation 101 thread, shame on you. Go read it now! Your plants deserve it.
That was the chart I used. What I didn't know was, much as I LOVE my mixed vent S&P, it simply does NOT suck like a centrifugal such as Vortex which, I suspect, was the type of fan used to make the chart. I've since taken to suggesting that prospective S&P buyers go one fan up from their "need."
Those unfamiliar with red's Ventilation 101 thread, shame on you. Go read it now! Your plants deserve it.
G
guest 77721
Thanks for the props, Freezerboy. There's nothing wrong with the S&P, it is just a fan design that produces less pressure than a centrifigual fan but more than an axial type.
Which I'd have known if I'd paid closer attention to your thread! You posted the chart for all to see.
I'm going to pretend I bought the fan before that chart came up. Much less depressing that way.
G
guest 77721
I'd stick with the 250. It will give you the right light intensity in the box.
Hell, I ran a 150HPS in my Rubbermaid and cooled it with a computer fan and a small scrubber with another computer fan. The 150 was great in two 18l tubs.
The problem is that you need 80-90 cfm total to cool and ventilate the box with a big fan that's plugged up with a scrubber.
I'd build it and see how your temps run.
Hell, I ran a 150HPS in my Rubbermaid and cooled it with a computer fan and a small scrubber with another computer fan. The 150 was great in two 18l tubs.
The problem is that you need 80-90 cfm total to cool and ventilate the box with a big fan that's plugged up with a scrubber.
I'd build it and see how your temps run.
G
guest 77721
Holy Cow,
I thought I'd hop onto the CanFan site to check out their specs. I started fooling around with thier fan and filter information and came up with this.
Then I stuck in the fan info for the S+P 100x fan. Man what a difference. This fan/filter combo will only produce about 40 CFM. Totally unsuitable for the 250 HPS.
I thought I'd hop onto the CanFan site to check out their specs. I started fooling around with thier fan and filter information and came up with this.
Then I stuck in the fan info for the S+P 100x fan. Man what a difference. This fan/filter combo will only produce about 40 CFM. Totally unsuitable for the 250 HPS.
Boy do I feel like a dummy. I can see my S&P falls off the map far more rapidly than the others but, I don't really understand how to read the chart or what it means. "Static Pressure inw c"? Do you have a link to the site where there are instructions on how to read this?
G
guest 77721
My ventilation 101 thread has all this info.
The chart is CFM vs pressure in inches of water column. The fan has it's own curve and so does the scrubber. Where the two cross is the operating point.
I did a quick job on the chart and have to clean it up a bit but it does show that the S+P fan doesn't do the job.
The chart is CFM vs pressure in inches of water column. The fan has it's own curve and so does the scrubber. Where the two cross is the operating point.
I did a quick job on the chart and have to clean it up a bit but it does show that the S+P fan doesn't do the job.
Inches In Water Column. Got it! I'll go back to 101 and read up. Thanks for the kick start.
I knew they didn't suck like a Vortex but, damn!
I knew they didn't suck like a Vortex but, damn!
G
guest 77721
Honestly, I don't know who started sticking fans on scrubbers and then trying to cool your light with it. Unless you get a good matchup, you're screwed.
I got a great fan/scrubber combo on the super stacker xL red. They are pc fans but they are badass pc fans. At 5v pretty quiet, about like a computer. At 12 v it's like jet engines, which is totally non stealth but could get me through a very hot day. I want to try your test, but it will have to wait til after turkey day.
All this has me thinking I should look into using a cool tube and hps.
All this has me thinking I should look into using a cool tube and hps.
G
guest 77721
Yep, cause it's my design and you're probably running with about 1/2" of carbon. The CanFan 2600 has about 1/2 in carbon as well and is made for axial fans.
Acutally the problem is that with the big filters have 2" of carbon or more so you have to get a centrifugal furnace blower to force the air through.
At least CanFan provides specs and air flows with various combos.
Acutally the problem is that with the big filters have 2" of carbon or more so you have to get a centrifugal furnace blower to force the air through.
At least CanFan provides specs and air flows with various combos.
It's got over an inch right now. Just to see. I'm going to take some out as the other one is fine with just a half inch. But these fans are insane, and will suck the carbon right out if I don't reduce it. But to power them, I need lotsa watts. No wall warts allowed.
It is true, there are many design elements taken from your thread, but no one can take credit for the scrubber. Scrubninja came up with the same thing I did. The original design you created used the true aire, which does not cut the mustard in flowering. Both scrub and I take a load off the fans by spreading the carbon over a large area, this reducing the pressure needed. I am convinced though, that the genius in your design is that it takes advantage of the hot air being less dense and collecting up top.
It is true, there are many design elements taken from your thread, but no one can take credit for the scrubber. Scrubninja came up with the same thing I did. The original design you created used the true aire, which does not cut the mustard in flowering. Both scrub and I take a load off the fans by spreading the carbon over a large area, this reducing the pressure needed. I am convinced though, that the genius in your design is that it takes advantage of the hot air being less dense and collecting up top.
G
guest 77721
oh, you haven't seen my sterlite box scrubber with the R2D2. It's the same as yours only with a single fan. I did that like 3 years ago.
It would suck up the carbon, dust actually. I had some filter cloth that I laid on top of the carbon to keep it place. I ended up screening the carbon to get the dust out before it went into the scrubber.
It would suck up the carbon, dust actually. I had some filter cloth that I laid on top of the carbon to keep it place. I ended up screening the carbon to get the dust out before it went into the scrubber.
Carbon should be washed prior to use. Not soap washed but, heavily rinsed and then dried.
