Extraction...Science vs Feel

[wutang]

Hey All

So recently I've purchased a fan controller and ran it really low during cold temps. My fan is basically specd just right according to the following calculations;

1.2x1.2x2.0 = 2.88 x 60 = 172.8 x 1.2 = 207m3/h

My fan is capable of moving 220m3/h

I had the controller at 40% fan speed but felt that the air was stale a few times opening the tent, so I bumped it up to 50%. Although better, according to the calculations I'm not shifting as much air and would need to run the fan at 95% all the time.

I just wanted to see how everyone manages it? Do you base it on calculations or just enough for negative pressure and just get a feel for what it should be?

I'm weary of pathogens so if I feel its stale, I keep increasing the fan speeds minimum setting on the controller.

I have good circulation and humidity is below 50%

Week 5 flower at the moment and I feel that I'm not getting that nice weed smell..more like a stale smell, although plants are healthy.

Thank you

[Guest]

Hey All

So recently I've purchased a fan controller and ran it really low during cold temps. My fan is basically specd just right according to the following calculations;

1.2x1.2x2.0 = 2.88 x 60 = 172.8 x 1.2 = 207m3/h

My fan is capable of moving 220m3/h

I had the controller at 40% fan speed but felt that the air was stale a few times opening the tent, so I bumped it up to 50%. Although better, according to the calculations I'm not shifting as much air and would need to run the fan at 95% all the time.

I just wanted to see how everyone manages it? Do you base it on calculations or just enough for negative pressure and just get a feel for what it should be?

I'm weary of pathogens so if I feel its stale, I keep increasing the fan speeds minimum setting on the controller.

I have good circulation and humidity is below 50%

Week 5 flower at the moment and I feel that I'm not getting that nice weed smell..more like a stale smell, although plants are healthy.

Thank you

I think you may be overthinking this (just what I see) as that calculatipon is just the mere "potential" of the fan at 100%/top fan speed.

Many people here use controllers, I use one with my RVK fan that plugs into a unit that plugs straight to the wall. This you can set a minimum fan speed and a temperature setting which fluctuatesby using a probe to measure inside the tent. This is called SMS COM Controller if you struggle to find it on ebay etc... I can upload I link for you?

I also use an AC Infinity inline fan with auto controller. These are near on silent fans and quality at that. This will adjust the fan speed to humidity and temperature.

It may also be worth you looking up VPD (Vapour Pressure Deficit), I see you mentioned negative pressure, this is a chart that shows + vs - pressure. This is what dictates your fan speed. As the temperature raises inside the tent, so should the fan speed generally. It all depends where you are pulling your air from too. Although I would worry too much, it's near impossible to get where you want to be on that chart.

You don't need to do calculations every time you adjust the speed.

Make it easy on yourself and get an auto controller, this way you can concentrate on the plant itself more.

Ink birds are also good tools for controlling things like humidity with heaters and heater tubes (more safe due to IP rating) which nuse a probe for contolling the heater on/off.

Hope this helps.

[Nom]

If you can keep temps etc in the zone the more air the better I guess. I've been running passive intake in my previous grows with only one vent open, the plant closest to the vent is always the best one come flower. The filter has also been on the same side as the vent and I put it down to the plant getting increased airflow. I had always ran my extraction as slow as possible due to noise and so only aimed for the the target extraction numbers like your calculations, well last summer I couldnt keep the temps or humidity down during flowering so I ran the fan at full power 90% of the time, best grow yet. Just my 2 pence

[Guest]

If you can keep temps etc in the zone the more air the better I guess. I've been running passive intake in my previous grows with only one vent open, the plant closest to the vent is always the best one come flower. The filter has also been on the same side as the vent and I put it down to the plant getting increased airflow. I had always ran my extraction as slow as possible due to noise and so only aimed for the the target extraction numbers like your calculations, well last summer I couldnt keep the temps or humidity down during flowering so I ran the fan at full power 90% of the time, best grow yet. Just my 2 pence

This is the thing everyone has their own way of doing things.

Plus everyones environments change from day to day, from hour to hour.

I think this is something that becomes second nature eventually, I don't tend to worry about it as much as I used to. Although this is also the reason I keep all my polystyrene packaging to insulate my grooms, so it is easier to contol the temp and humidity

[wutang]

Hey All

So recently I've purchased a fan controller and ran it really low during cold temps. My fan is basically specd just right according to the following calculations;

1.2x1.2x2.0 = 2.88 x 60 = 172.8 x 1.2 = 207m3/h

My fan is capable of moving 220m3/h

I had the controller at 40% fan speed but felt that the air was stale a few times opening the tent, so I bumped it up to 50%. Although better, according to the calculations I'm not shifting as much air and would need to run the fan at 95% all the time.

I just wanted to see how everyone manages it? Do you base it on calculations or just enough for negative pressure and just get a feel for what it should be?

I'm weary of pathogens so if I feel its stale, I keep increasing the fan speeds minimum setting on the controller.

I have good circulation and humidity is below 50%

Week 5 flower at the moment and I feel that I'm not getting that nice weed smell..more like a stale smell, although plants are healthy.

Thank you

I think you may be overthinking this (just what I see) as that calculatipon is just the mere "potential" of the fan at 100%/top fan speed.

Many people here use controllers, I use one with my RVK fan that plugs into a unit that plugs straight to the wall. This you can set a minimum fan speed and a temperature setting which fluctuatesby using a probe to measure inside the tent. This is called SMS COM Controller if you struggle to find it on ebay etc... I can upload I link for you?

I also use an AC Infinity inline fan with auto controller. These are near on silent fans and quality at that. This will adjust the fan speed to humidity and temperature.

It may also be worth you looking up VPD (Vapour Pressure Deficit), I see you mentioned negative pressure, this is a chart that shows + vs - pressure. This is what dictates your fan speed. As the temperature raises inside the tent, so should the fan speed generally. It all depends where you are pulling your air from too. Although I would worry too much, it's near impossible to get where you want to be on that chart.

You don't need to do calculations every time you adjust the speed.

Make it easy on yourself and get an auto controller, this way you can concentrate on the plant itself more.

Ink birds are also good tools for controlling things like humidity with heaters and heater tubes (more safe due to IP rating) which nuse a probe for contolling the heater on/off.

Hope this helps.

Cheers dude

I have a controller but I think min fan setting was too low. I'm increasing it daily to see if the smell goes.

[wutang]

If you can keep temps etc in the zone the more air the better I guess. I've been running passive intake in my previous grows with only one vent open, the plant closest to the vent is always the best one come flower. The filter has also been on the same side as the vent and I put it down to the plant getting increased airflow. I had always ran my extraction as slow as possible due to noise and so only aimed for the the target extraction numbers like your calculations, well last summer I couldnt keep the temps or humidity down during flowering so I ran the fan at full power 90% of the time, best grow yet. Just my 2 pence

That's helpful dude. I'm thinking the same now as I've been running my fan at 50% less than the calculation so that's clearly not good. I guess I was trying to keep the temps up during the cold but my fan at full speed is just over the desired airflow.

Before a fan controller I was running at full pelt so have never come across this where the airflow wasn't enough. I guess the more you add, more mistakes and more learning!

Cheers dude.

[wutang]

I'm in week 5 flower and they don't even have a nice weed smell! No signs of rot or mould. I have good circulation, ram clip ons and eco ran running. But would poor extraction cause the flowers not to smell?

[Guest]

I'm in week 5 flower and they don't even have a nice weed smell! No signs of rot or mould. I have good circulation, ram clip ons and eco ran running. But would poor extraction cause the flowers not to smell?

I've wondered this on a lot of my grows.

Then I left my room without the fans on once and went in there, luckily after not leabing it too long. It stank!

Maybe this is just the fans, extraction anmd filter doing their job.

[wutang]

I'm in week 5 flower and they don't even have a nice weed smell! No signs of rot or mould. I have good circulation, ram clip ons and eco ran running. But would poor extraction cause the flowers not to smell?

I've wondered this on a lot of my grows.

Then I left my room without the fans on once and went in there, luckily after not leabing it too long. It stank!

Maybe this is just the fans, extraction anmd filter doing their job.

True man. Its just the stale smell that scares me. Lets see what happens!

Peace

[Josh]

If your tent walls pull in a bit, you're good to go in my opinion

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