Live Stoner Chat Rhino filter problem

[Son of Hobbes]

If the m3 of a filter is more than m3 of a fan, it's better then the other way around since the powerful fan would try to suck a lot of air through a small hole, correct? =)
My guess is that the filter should always have bigger m3 spec than the fan. Correct me if I'm wrong.

To your first question; yes, you would not want the fan to be more powerful than the rating of the scrubber. Here's my quote why:

The idea is to be as close to the HIGH end of that rating (but not over it.) If you exceed your m3/h rating of your scrubber (even after taking into consideration air flow reductions,) you'll be moving air through the filter so fast that it won't have adequate time to effectively trap those odor causing molecules in the carbon.

If you are too under-powered though; you're greatly reducing the efficiency of the scrubber, on top of causing your fan to work harder. That's not a good thing. On Rhino's website; they list that scrubber at a static 500 m3/h, not in a range. You're running a 280 m3/h fan for a scrubber that has a requirement something closer to a 500 m3/h fan, almost half of what it would need to operate closer to max efficiency. If it seems like your old no-name filter had a much easier time passing air through it; then it would probably stand to reason it was a lower m3/h rating than your new rhino filter.

As to this question:

My guess is that the filter should always have bigger m3 spec than the fan. Correct me if I'm wrong.

Yes, you wouldn't want to exceed the m3/h rating of the filter with your fan.

The filter's m3/h rating is dependent on factors like size, shape, and design of the filter hardware type and grade of carbon, amount, etc. Carbon can be granulated or powdered and what is used varies by manufacturer.

You size your carbon scrubber to your grow space, then the fan to the carbon scrubber.

Does that make sense?

:Cheers me Dears:

 

[Power.P]

Yes, it makes perfect sence, thank you for the explanation.
However I'm still guessing how do I determine the sweet spot between the filter's and fan's m3/h ratings? The idea of having it as close as possible makes sence but I'd like to understand either the maximum m3/h or the % difference between them.

Edit: my fan is switchable netween 280 and 380 m3/h so I'll just switch to more powerful mode. That's the only thing I'm able to do right now.

 

[oldster]

Fans are designed to work within specific back pressure ranges. It sounds like the resistance of your filter is well beyond the design spec of your fan. Your filter's spec should include the resistance in mm of Mg. You will need to find a fan designed to move the rated volume of air at the filters stated resistance or back pressure.


You may want to return both if possible and purchase a combo unit that is designed to work together. If that is not an option look for an axial vane fan design. The work at higher pressures than the typical blade fan

 

[Gonzo]

Hello,


I have just got my SP Silent 250/100, the smallest one, because I have my tent locked in not so good ventilated room 5 times bigger than tent.
It works good and silent but as soon as I close in/out flow I see that it struggles because to build silent fan, low power and high efficiency have to be achieved.


When I compare it to my Prima klima, sold for tent growing, which develops 400 m3/h @ 60w, I see that SP silent is in fact home product, meant for low duty job with first task to be silent. It has potent airflow only if not disturbed at all. I have not connected it to carbon filter yet, I will tomorrow and see if it works.


Prima klima is cheap and powerfull, but it makes sounds.Even if on low power. SP is silent and weak. Seems that you can not get power and silence in one box.

 

[Groff]

Hello,


I have just got my SP Silent 250/100, the smallest one, because I have my tent locked in not so good ventilated room 5 times bigger than tent.
It works good and silent but as soon as I close in/out flow I see that it struggles because to build silent fan, low power and high efficiency have to be achieved.


When I compare it to my Prima klima, sold for tent growing, which develops 400 m3/h @ 60w, I see that SP silent is in fact home product, meant for low duty job with first task to be silent. It has potent airflow only if not disturbed at all. I have not connected it to carbon filter yet, I will tomorrow and see if it works.


Prima klima is cheap and powerfull, but it makes sounds.Even if on low power. SP is silent and weak. Seems that you can not get power and silence in one box.

You can! I bought a 8" (200mm) 1350m2/h RVK type fan and reduced 1/5 to 1/4th the speed (winter/summer) with a voltage controller. Sucks 45w-60w and pulls between 270 - 350m3/h. Silence.
For me this airflow is more than enough

 

[Gonzo]

You can! I bought a 8" (200mm) 1350m2/h RVK type fan and reduced 1/5 to 1/4th the speed (winter/summer) with a voltage controller. Sucks 45w-60w and pulls between 270 - 350m3/h. Silence.
For me this airflow is more than enough

Yes, you have bought more powerfull one and speed contoller, what is the best way to do and now when I read your post I believe that this is also the most silent way to go. Not to push small fan on full power.


I have got one speed fan (timer editon) by mistake and it only works on full power, 24W, which is supposed to be 240M3/h. Yes, but only if the alir flow is totally undisturbed. And fan is quite loud, but sounds go down immediatelly when I close holes with hand a little.


Yes, the best way would be to buy more powerfull device and run it on low power. Since I will have to send mine back to UK, I think I will get myself a little more powerfull one with speed control.


When I bought Prima klima I bought one with speed control and quite powerfull. I run it on low power, but it releases noises as well as when on full power, just that noises are of different kind. But it was cheap.


Do you use TD 800/200 silent?


Which speed control do you use? One of these?
http://www.tlc-direct.co.uk/Products/SLTD500SILENT.html


Do you still have two speed option when speed control in use? Or it takes over and you just adjust speed of rotation.


Seems that low entry S&P silent models are really poor with power and hardly meet growers demand, because they are meant for something else than sucking air through carbon filter.


So, Power.P, seems that we have bought to weak fans. I hope I will manage to send mine back (I have got wrong model) and get myself a bigger one with speed control.


Costs again, yes, but we all now that ladies are expencive anyway. And buds on them smile at me so nicely, that I will easily get them some silent fresh air.


Thank you guys for sharing information.

 

[Power.P]

Well, all you say is true but look at http://www.rhinofilter.com/pro.html and what fans they offer for each filter.
For the filter that I've got (125 x 300, 500 m3/hr) they propose one of 125mm fans that can only do 220-420 m3/hr depending on the model.
This contradicts your theory. Can you explain that?

 

[Gonzo]

Perhaps the power of a small fan is just not enough to make real 220-240m3 throughput. And the solution is to buy more powerfull fan, which will deliver much more power on the same wattage if contolled by speed control as smaller model. Real power, not that one from theory or perfect conditions. And less noise too.


As soon as I had connected my TD250/100 silent I had realized, that its power is really little. Yes, this is domestic product line. If I close its holes with hands it loses power immediately.

 

[Power.P]

I've got the TD Silent 125 datasheet with graphs, now I need to know the exact resistance of my Rhino filter to make sence of current airflow lol. They don't have it specified anywhere (

 

[oldster]

I would try contacting the manufacturer. Did some checking and could not find the rating by either looking for the filter or the fan that is recommended for it
http://rhinofilter.com/index.html


Good luck