You should take a smaller filter if you run with less speed :thumbs:
New Grower which active carbon fiklter for this lti is it stzromg enough?
- Thread starter dfx12
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I now they are pricy but like Mario said if i needed to start over I certainly would bye a td s&p!
Better to take the smaller one for such a small cab! And a have a spare one!
Better to take the smaller one for such a small cab! And a have a spare one!
oh - i posted the wrong data:
i decidedto buy this fan(lti with 341m3/h):
http://www.growland.net/Rohrluefter-LTI-345-cbm-h-r125
and this charcoil filter (with 400m3/h maximum):
http://www.growland.net/Carbon-Active-400ml-h-125mm
@:soilent green: did you mean this size?
i will run that system on half speed and will use a sonodec to minimize the noise.
that charcoil filter is a special one, because it has 100% more surface to filter 100% of odour/smell. of course itcosts the double amount of money, but i want to grow some stinky plants, as i said hehe...
:stylez rasta smoke:
edit: i will take some days to be really sure about my descision. also, i will keep the td silent in mind. don't really know, but in the end it will be one of this 2 possibilitys.
@super mario:
do you mean, that the 400m3/h filter is too big, when i run the 341m3/h - fan with half speed, or is this ok with it?
i decidedto buy this fan(lti with 341m3/h):
http://www.growland.net/Rohrluefter-LTI-345-cbm-h-r125
and this charcoil filter (with 400m3/h maximum):
http://www.growland.net/Carbon-Active-400ml-h-125mm
@:soilent green: did you mean this size?
i will run that system on half speed and will use a sonodec to minimize the noise.
that charcoil filter is a special one, because it has 100% more surface to filter 100% of odour/smell. of course itcosts the double amount of money, but i want to grow some stinky plants, as i said hehe...
:stylez rasta smoke:edit: i will take some days to be really sure about my descision. also, i will keep the td silent in mind. don't really know, but in the end it will be one of this 2 possibilitys.
@super mario:
do you mean, that the 400m3/h filter is too big, when i run the 341m3/h - fan with half speed, or is this ok with it?
Last edited:
Congrats 
. Nope you can use the filter without problems. But you need to be careful with your step transformator. If you pull with less than 100m3, it will smell because the fan can't overcome the resistance of the filter.
But be aware that many things I said here, were with taking in consideration that you want to use a step transformator to slow down the fan, if you run it at full speen, some things might not apply.
Enjoy your new fan & filter :High 5:
. Nope you can use the filter without problems. But you need to be careful with your step transformator. If you pull with less than 100m3, it will smell because the fan can't overcome the resistance of the filter.But be aware that many things I said here, were with taking in consideration that you want to use a step transformator to slow down the fan, if you run it at full speen, some things might not apply.
Enjoy your new fan & filter :High 5:
Congrats
Enjoy your new fan & filter :High 5:
i will! thx my friend!:smokebuds:
One thing to keep in mind is that filters have a minimum required airflow as well. This is normally around 25% of the max rating so for a 400 m3/h filter you should run at least 100m3/h through it. If the airflow is too low then there isn't enough negative pressure over the filter and the air will only flow through the part of the filter closest to the fan and not over the whole surface. Then that part of the filter will get used up and you get a shorter life-span of your filter.
If you will never run it at full speed you could also go for a size smaller and use the 300m3/h filter. I'm using the carbon active 400m3/h myself with the TD silent 280/380 m3/h with a 5-step transformer. I'm probably pretty close to the lower limit of a 100 and I have used it 5 months so far without issue. Next time I will get the 300 though since I never run it at full speed.
If you will never run it at full speed you could also go for a size smaller and use the 300m3/h filter. I'm using the carbon active 400m3/h myself with the TD silent 280/380 m3/h with a 5-step transformer. I'm probably pretty close to the lower limit of a 100 and I have used it 5 months so far without issue. Next time I will get the 300 though since I never run it at full speed.
M
Mr Piggy
Guest
Hey guys, I have a similar sized tent and setup.
I run a S&P TD100x in a DR 60 II with a 4 x 12 200cfm filter and it works like a charm.
The TD100x is by no means silent, but it's nice and quiet once you build a muffle box for it. I've been running the filter for six months continuously with some stinky pot in it and not a trace escapes until I unzip the tent and it blast me.
just my
I run a S&P TD100x in a DR 60 II with a 4 x 12 200cfm filter and it works like a charm.
The TD100x is by no means silent, but it's nice and quiet once you build a muffle box for it. I've been running the filter for six months continuously with some stinky pot in it and not a trace escapes until I unzip the tent and it blast me.
just my
ok, thank you all!
i will follow your advices and will buy the 300m3/h filter instead the 400er, because you are right - i will never run it on full speed. i chose the fan/lti with 341m3/h cause i want to have a big range of power. my plan is to run it not lower than 200m3/h and never run on full speed. the reason i chose the big one is because of the less noise, when i run it on slower speed.
one question: how can you be sure on which power the fan runs? how can you say, it, for example, runs on 200m3/h? how do you come to this conclusion? how did you measure that?
a nice thurday for ya all and keep in mind today, that tommorrow the weekend starts... yeah! :8
yours
hope
i will follow your advices and will buy the 300m3/h filter instead the 400er, because you are right - i will never run it on full speed. i chose the fan/lti with 341m3/h cause i want to have a big range of power. my plan is to run it not lower than 200m3/h and never run on full speed. the reason i chose the big one is because of the less noise, when i run it on slower speed.
one question: how can you be sure on which power the fan runs? how can you say, it, for example, runs on 200m3/h? how do you come to this conclusion? how did you measure that?
a nice thurday for ya all and keep in mind today, that tommorrow the weekend starts... yeah! :8
yours
hope
Figuring out how much airflow you have with a lower voltage is the tricky part. I did not measure it, I believe the equipment for measuring is pretty expensive and you don't need to know the exact airflow. As long as you're fairly certain your above the minimum of the filter and the grow tent doesn't get to hot you should be fine.
I did some rough calculations to figure out the airflow. As far as I could find RPM of the fan varies pretty linearly with the voltage, so if you cut the voltage in half you get half the RPM. However, airflow has a more quadratic dependence on RPM so if you half the RPM you only get a quarter of the airflow. Additionally since the TD silent runs at two speeds I knew the RPM and airflow for those two speeds from the manufacturer and it was not exactly quadratic, it's somewhere in between linear and quadratic. Anyway, I ended up with a calculated airflow between 120-140 and I figure with the resistance of the filter I'm probably pretty close to a 100 in the end. I would say if you stay around 140 to 170V you should be on the safe side.
I also measured the voltage at the different steps (using a power meter, they're pretty cheap) and although the transformer was supposed to give out 170-140-110V it was actually 170-150-97V. I tried running it at 97V but then there is a significant drop in airflow, it's very noticeable if you put your hand in the airstream and change the voltage.
I did some rough calculations to figure out the airflow. As far as I could find RPM of the fan varies pretty linearly with the voltage, so if you cut the voltage in half you get half the RPM. However, airflow has a more quadratic dependence on RPM so if you half the RPM you only get a quarter of the airflow. Additionally since the TD silent runs at two speeds I knew the RPM and airflow for those two speeds from the manufacturer and it was not exactly quadratic, it's somewhere in between linear and quadratic. Anyway, I ended up with a calculated airflow between 120-140 and I figure with the resistance of the filter I'm probably pretty close to a 100 in the end. I would say if you stay around 140 to 170V you should be on the safe side.
I also measured the voltage at the different steps (using a power meter, they're pretty cheap) and although the transformer was supposed to give out 170-140-110V it was actually 170-150-97V. I tried running it at 97V but then there is a significant drop in airflow, it's very noticeable if you put your hand in the airstream and change the voltage.
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