exhaust help

[EmptyWords]

ok i have a dr240 tent and its 8x8x7 and i want to run a charcoal filter. Can somebody tell me what would be a good fan for me to use and even what filter to use maybe? I am posting an image of an amazing drawing i just did showing what im doing so maybe that will help. Im duct reducing to 6 in to get the ducting to fit where i want it. if you have any suggestions please tell me. Thanks alot.

 

[ROBinBKK]

Ruck seem to have the best reputation...

rhino filters are the way...

 

[EmptyWords]

thanks but im trying to figure out cfm more than anything. I do like those ruck fans i just checked them out. i just need help with cfm. I heard when using a charcoal filter to add 20% to your normal cfm that you would be using so im kinda having some trouble. I want to make sure airflow is good but not overboard.

 

[EmptyWords]

so can anyone help me to figure out what cfm would be good for me?

 

[Motobomb62]

The filter manufacturer will tell you what size to use. It all depends on the amount of time it takes for the air to pass through the media. So it really depends on the brand/size of filter you have/buy. Many times you can buy a fan filter combo that are designed to work together. Check out some manufacturer websites. I use a can33 filter with a 6" stnd. canfan. Works great for me.

 

[redi jedi]

so can anyone help me to figure out what cfm would be good for me?

Calculate the volume of your tent (LxWxH) divide that number by 5. That will give you the amount of cfm required to exchange the air in your tent every 5 min. Thats the recommended minimum.....this question has been answered many times.....

As to the filter, lets say for example you need 200cfm to achieve 12 exchanges/hour (every 5min) then buy a filter thats rated for at least 200 cfm, its that simple....

 

[EmptyWords]

Calculate the volume of your tent (LxWxH) divide that number by 5. That will give you the amount of cfm required to exchange the air in your tent every 5 min. Thats the recommended minimum.....this question has been answered many times.....

As to the filter, lets say for example you need 200cfm to achieve 12 exchanges/hour (every 5min) then buy a filter thats rated for at least 200 cfm, its that simple....

thanks for your response.
I guess i will buy the Can-Fan RS-6 which is 270 cfm with a can 33 filter which is 200 cfm, But im wondering if the filter being 200 cfm will work right or if i need to find something closer to 270 cfm. Can anyone answer this for me? sorry for all the questions I just want to make sure everything is done correctly. Thanks.

 

[Motobomb62]

Thats what I am running. and it works great. You can get variable speed controllers to slow down your fan if you experience problems with too much flow. I just got one, but only because I got it for free, I still have not plugged it in to see what the difference is. Maybe in the winter I will turn down the speed, but in the Summer I want full speed.

 

[EmptyWords]

Thats what I am running. and it works great. You can get variable speed controllers to slow down your fan if you experience problems with too much flow. I just got one, but only because I got it for free, I still have not plugged it in to see what the difference is. Maybe in the winter I will turn down the speed, but in the Summer I want full speed.

Alright cool, thanks for you reply.

 

[EmptyWords]

Ok, so i am ready to buy my fan and filter. I want the 6 in can fan "270 cfm" and can 33 filter "200 cfm" but I wouldnt mind spending a little extra on the can fan HO 6 in "440 cfm" and can filter 50 "420 cfm". All i want to know is, is the 6 in HO fan combo overkill for a 8x8x7 grow tent?

 

[EmptyWords]

also the grow tent only supports 65 pounds of weight and the filter alone weighs 65 pounds. anyone have any ideas of what i should do to hang the filter?

 

[fred flintstoned]

First, you're cfm ratio is backwards, If the fan pulls air faster than the filter rating, the scrubbing of the funk is compromised. Air must be in contact with the carbon long enough to be effective.
If you're expecting this duo to cool as well as clean the air, I say go bigger! When I had a 10x10 room, I started with a can33 and a 6in fan. I was running 2400W and the room stayed around 85*, way too hot. I switched to a 8in Vortex fan (745 cfm) and a Mountain Air filter. I actually had to slow down the fan, it was too cool!(73*). While this setup is overkill for you, I strongly suggest you shoot for 1 full air exchange every 2-3 minutes, 1 min. is better. A 6in. Vortex may fit the bill. Also check if the fan can be speed controlled, some Canfans can't be slowed down. Speedster brand fan controllers are about $25 anywhere on the net.
As for weight, I sure you could rig some sort of cradle supported by 1in. pvc or something similar running up the sides of the tent.
For best Vortex prices on the net: plantlightinghydroponics.com. I've bought several fans here and they're 30% below anyone else. Also, the Mountain Air filters last about 3 years, Can filters, about 1 year. Seems well worth the 40% difference in price.
Hope this helps,
Fred

 

[EmptyWords]

First, you're cfm ratio is backwards, If the fan pulls air faster than the filter rating, the scrubbing of the funk is compromised. Air must be in contact with the carbon long enough to be effective.
If you're expecting this duo to cool as well as clean the air, I say go bigger! When I had a 10x10 room, I started with a can33 and a 6in fan. I was running 2400W and the room stayed around 85*, way too hot. I switched to a 8in Vortex fan (745 cfm) and a Mountain Air filter. I actually had to slow down the fan, it was too cool!(73*). While this setup is overkill for you, I strongly suggest you shoot for 1 full air exchange every 2-3 minutes, 1 min. is better. A 6in. Vortex may fit the bill. Also check if the fan can be speed controlled, some Canfans can't be slowed down. Speedster brand fan controllers are about $25 anywhere on the net.
As for weight, I sure you could rig some sort of cradle supported by 1in. pvc or something similar running up the sides of the tent.
For best Vortex prices on the net: plantlightinghydroponics.com. I've bought several fans here and they're 30% below anyone else. Also, the Mountain Air filters last about 3 years, Can filters, about 1 year. Seems well worth the 40% difference in price.
Hope this helps,
Fred

I decided on the fan and filter combo because alot of sites sell the 6 in HO can fan and can 50 filter combo together. I need to make sure this room stays cool, thats why im looking at higher cfm. I am using a radiant 8 reflector with 8 inch flanges and running 1000w but i plan on eventually running 2000 watts. I am not too familliar with anything besides can fans and thats why i was deciding to go with them. I just looked at the vortex fans and they seem like a good idea. Do you have any recommendation on what to get for a 8x8x7 grow tent? like what would you buy? and i would also be interested in the fan controller. I also solved my problem for hanging a heavy filter, i will just weld a steel hanging system for it, seems easy enough. Sorry for all the questions i just need to make sure the fan and filter will work correctly for my situation.

 

[fred flintstoned]

You're talking about 428 cubic feet. With 1000W, the 6HO/50 should work. I think the HO is an over driven 6". If that's the case, I would question longevity. While Canfans work well for zillions of people, I always look for the best quality I can afford.
When using 2000W, the game changes considerably. 1000W lamps generate at least 4000btu of heat each. At this point you might seriously consider an 8in. fan combo. You can always slow it down at first and save the cost of an upgrade when you get more light.
I always over build, never regretted it. This hobby is very addictive. You'll always want something bigger!
Fred

 

[EmptyWords]

You're talking about 428 cubic feet. With 1000W, the 6HO/50 should work. I think the HO is an over driven 6". If that's the case, I would question longevity. While Canfans work well for zillions of people, I always look for the best quality I can afford.
When using 2000W, the game changes considerably. 1000W lamps generate at least 4000btu of heat each. At this point you might seriously consider an 8in. fan combo. You can always slow it down at first and save the cost of an upgrade when you get more light.
I always over build, never regretted it. This hobby is very addictive. You'll always want something bigger!
Fred

well i definitely plan on going with 2000w on the second grow but for the first i will be using 1000w. so you think maybe i should just buy the 8 in fan and slow it with a fan controller? if so wouldnt slowing it effect using the appropriate filter for what the fan is rated?

 

[fred flintstoned]

Just the opposite. At a slower speed, air is in contact with the carbon for a longer period. When you go to 200W you'll be happy you have the larger filter.
Since it's almost summer, you may not need to slow it down with 1000W, depends on your intake air temps. If your home AC vents into the room, you're golden.
Fred

 

[EmptyWords]

Just the opposite. At a slower speed, air is in contact with the carbon for a longer period. When you go to 200W you'll be happy you have the larger filter.
Since it's almost summer, you may not need to slow it down with 1000W, depends on your intake air temps. If your home AC vents into the room, you're golden.
Fred

yes my home ac does vent into the room. so you recommend the 8 in vortex? and an 8 inch Mountain Air filter? i will also buy the fan controller just in case. Thanks for all your input it is very appreciated.

 

[fred flintstoned]

No prob. Just about everything I know about indoor rooms, I learned on the forums. Glad to be able to pass some info on to someone else.
Fred