Inline Fan HELP

Y

YUKKI

Member
Hey this is my first post (though i have been looking though these forums for awhile) but i was wondering if this cheap ebay fan would work fine in a grow tent with a carbon filter attached. if not if any of you guys can point me in the direction of how i can get two 4" fans for cheap that will get the ventilation/odor control job done.

http://www.ebay.com/itm/Rule-4-In-Line-Bilge-Blower-Marine-Fan-240-/160773151637?pt=LH_DefaultDomain_0&hash=item256ed39b95

thanks in advance
p.s. i am new so please dont rage at me
 
fir3dragon

fir3dragon

Well-Known Member
YUKKI said:
Hey this is my first post (though i have been looking though these forums for awhile) but i was wondering if this cheap ebay fan would work fine in a grow tent with a carbon filter attached. if not if any of you guys can point me in the direction of how i can get two 4" fans for cheap that will get the ventilation/odor control job done.

http://www.ebay.com/itm/Rule-4-In-Line-Bilge-Blower-Marine-Fan-240-/160773151637?pt=LH_DefaultDomain_0&hash=item256ed39b95

thanks in advance
p.s. i am new so please dont rage at me
Click to expand...

you dont want the cheapest things, instead of 2 4 inches why not 1 6 inch fan and filter?
 
Y

YUKKI

Member
well my research has shown that you need the same amount of CFM going in an out of the tent to have a negative pressure thing goin on
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
(high in the tent)Carbon filter>>>>>fan>>>>>>>>>hood>>>>>>>>>out the tent




>>>>>>>>>>>> <<<<<<<<<<<<<(passive intakes low)

This will create a postive pressure in your duct work/hood and negative pressure in your tent, no stinky leaks. But your going to need a better fan than that.
 
Y

YUKKI

Member
Alexander Supertramp said:
(high in the tent)Carbon filter>>>>>fan>>>>>>>>>hood>>>>>>>>>out the tent




>>>>>>>>>>>> <<<<<<<<<<<<<(passive intakes low)

This will create a postive pressure in your duct work/hood and negative pressure in your tent, no stinky leaks. But your going to need a better fan than that.
Click to expand...

thanks for the tip so is there ducting on the other side of the hood and going out the tent and bring in air from outside the tent or is there nothing connected to the other side of the hood. and i know this is alot to ask but do you know of any specific fans you would suggest. thanks again.
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
Duct work leading from hood to outside of tent. Your intakes are at the bottom of the tent and are passive meaning the negative pressure developed inside the tent by the filter/fan and exit ducting creates the passive intake. A good rule of thumb is to exchange the air in your tent every 5 minutes or so. For example a 3ftX3ftX7ft tent is 63 cubic ft. You lose some of the rated cfms of the fan in the duct work. So in this case a 240cfm or so fan should do the trick. Alot also depends on the ambient temp of the room the tent resides in....also be sure not to hook your fan directly to the filter, use a short section of ducting to isolate the vibration of the fan from the filter. Even though the filter come packed pretty tight with carbon the vibration of the fan can settle it causing void in the filter and possible unscrubbed air exiting the tent.....this is also why you want a postive pressure in your ducting and hood to avoid odor leaks....by have a positive pressure any leaks will be recycled through the tent and system and greatly reduce the risk of odor leaks......
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
Duct work leading from hood to outside of tent. Your intakes are at the bottom of the tent and are passive meaning the negative pressure developed inside the tent by the filter/fan and exit ducting creates the passive intake. A good rule of thumb is to exchange the air in your tent every 5 minutes or so. For example a 3ftX3ftX7ft tent is 63 cubic ft. You lose some of the rated cfms of the fan in the duct work and filter. So in this case a 320cfm or so fan should do the trick. Alot also depends on the ambient temp of the room the tent resides in....light wattage ect....
 
nuglets

nuglets

New Member
YUKKI said:
thanks for the tip so is there ducting on the other side of the hood and going out the tent and bring in air from outside the tent or is there nothing connected to the other side of the hood. and i know this is alot to ask but do you know of any specific fans you would suggest. thanks again.
Click to expand...
everything i've ever seen or read says that your fan should be pulling air through your hoods and not pushing it. plus every room i have ever seen on this forum is setup that way. try looking at how some of the bigger ops and more experienced growers have theirs setup. all of them pull air through their hoods and then put their fan as close to the exhaust point in the room. fans run more efficiently this way because there is no pressure in from of them. if your hoods are sealed then you will not have to worry about odor leaking into them. use duct tape of flash tape to seal them if they are not well constructed.

for fans i would recommend can or vortex. i've seen a couple tests done and they seem to be the only ones that actually perform to their cfm ratings.
 
Y

YUKKI

Member
thanks everyone for the help i didnt expect to get these responses so quick. as for the ducting for the intake side i should put some kind of filter over it right to keep contaminants and such from getting in and does it need to be at the bottom or is across from the fan and filter exhaust.
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
YUKKI said:
thanks everyone for the help i didnt expect to get these responses so quick. as for the ducting for the intake side i should put some kind of filter over it right to keep contaminants and such from getting in and does it need to be at the bottom or is across from the fan and filter exhaust.
Click to expand...
Hope you had a good day fishing Phil.......I mean YUKKI
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
nuglets said:
everything i've ever seen or read says that your fan should be pulling air through your hoods and not pushing it. plus every room i have ever seen on this forum is setup that way
Click to expand...
What you read on this forum and real world application seem to be two totally different things....
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
nuglets said:
everything i've ever seen or read says that your fan should be pulling air through your hoods and not pushing it. plus every room i have ever seen on this forum is setup that way. try looking at how some of the bigger ops and more experienced growers have theirs setup. all of them pull air through their hoods and then put their fan as close to the exhaust point in the room. fans run more efficiently this way because there is no pressure in from of them. if your hoods are sealed then you will not have to worry about odor leaking into them. use duct tape of flash tape to seal them if they are not well constructed.

for fans i would recommend can or vortex. i've seen a couple tests done and they seem to be the only ones that actually perform to their cfm ratings.
Click to expand...
Guess the folks that actually make the fan is wrong. And placing them at he end of the line may reduce the pressure in front of them but its still dragging behind them, adding extra heat from the bulb to your fans motor. Unnoticed holes do occur in ducting also......
When Air cooling lights, should you push or pull your airflow?We recommend to push the air through your air cooled lights to avoid overheating your fan and to create a positive air pressure in your ducting and light hoods.Approximately 150 - 200 CFM is required to air cool a 1000W Bulb.
http://canfilters.com/faq.html



 
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