inline fan and filter question

Yo guys whats up so I was wondering can I attach my fan directly to my filter or does there have to be a piece of ducting separating the 2. Right now I have the fan sitting on top of my grow tent/closet set up put the top is a piece of wood so the fan fibrates on it and ive tried attaching the fan directly to the filter before to test them out and there was no vibration and much more quieter so I want to do it that way, but I feel like I heard somewhere that its bad can someone please help I need to turn my filter on tomorrow.
 

NorthofEngland

Well-Known Member
I don't see why it should make any difference?

If you can still position your fan and your filter where you need them....Do it.
 

tip top toker

Well-Known Member
Technically' no. Although I'm thinking that the more ducting between the fan and the filter, the lower the air pressure by the time it gets to the filter, and as such the higher the level of filtration. Hopefully someone with an actual understanding of science can expand on the merits or faults of my thinking.
 

NorthofEngland

Well-Known Member
Technically' no. Although I'm thinking that the more ducting between the fan and the filter, the lower the air pressure by the time it gets to the filter, and as such the higher the level of filtration. Hopefully someone with an actual understanding of science can expand on the merits or faults of my thinking.
Yes - but the more ducting, the less pressure.
 

tip top toker

Well-Known Member
Yes - but the more ducting, the less pressure.
I'm lost. You've just repeated what I stated and expanded on nothing. My thinking was the sloewer the air passes through the filter, the more efficient the filtration will be. I have always read people stating that its good to have as much ducting between the fan and filter as possible. I'm not talking enough ducting that the fan no longer exchanges air at a suitable rate, but a compromise between the cfm of the fan, the required exchange rate, and the pressure when the air hits the filter.
 

alwaysgreen420

Active Member
It will filter better. Its not loosing anything from ducting. Will use your filter fully. Try it out. Hook it to filter feel how it pulls then hook ducting and feel how it pulls through filter. Just making sure u are pulling through filter and not pushing thru?

Sent from my SCH-I545
 

NorthofEngland

Well-Known Member
I'm lost. You've just repeated what I stated and expanded on nothing. My thinking was the sloewer the air passes through the filter, the more efficient the filtration will be. I have always read people stating that its good to have as much ducting between the fan and filter as possible. I'm not talking enough ducting that the fan no longer exchanges air at a suitable rate, but a compromise between the cfm of the fan, the required exchange rate, and the pressure when the air hits the filter.
Why would lower suction make the filter more effective?
I don't get the logic behind that....?
The idea that air can be sucked through the filter fast enough to lessen the filtration effects just doesn't equate, to me.

Less ducting = More suction (or pressure).
Surely this is a good thing....?

My temps have been dropping a little too low, during dark cycle
(I have 12 hours dark during the day - the warmest hours - but it's still cold)
So today I used a dimmer switch to lower the inline fan speed.

I have no way of measuring what percentage of speed I've lowered by but it's much quieter and feels far less 'energetic' (vibrations).
The temps in the tent stay higher (relative to outside temps) and there is still absolutely no hint of an odour - even when I stick my face in the ducting at the extraction point.

This makes me believe that carb filters can function perfectly well with much lower suction (air pressure) anyway.
But I don't think really high pressure would decrease the efficacy.

But, it still remains, the less ducting the more fan efficiency.
 

tip top toker

Well-Known Member
I'm not talking about sucking through the filter. Rather blowing. Fan then filter.

To me, Commons sense would dictate that the slower the air passes through the carbon, the higher the efficiency of removing the smell. No different to forcing something through a sieve as opposed to letting it drip through. Lowest the pressure, the better the quality of the filtration.
 

NorthofEngland

Well-Known Member
I'm not talking about sucking through the filter. Rather blowing. Fan then filter.

To me, Commons sense would dictate that the slower the air passes through the carbon, the higher the efficiency of removing the smell. No different to forcing something through a sieve as opposed to letting it drip through. Lowest the pressure, the better the quality of the filtration.
I think it would either have to speed up or slow down quite a bit before odours escaped in recognisable amounts.
Just ask anyone with speed control attached to their fans.
 

tip top toker

Well-Known Member
Possibly so. As i said, i'm no scientist, just something that popped into my head, that could very well be wrong.
 
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