Inline fans, push or pull air?

i had a fan pulling hot air out from a duct to the cool tube and drawing [from a duct] fresh air in but the fan did not last 12 months it over heated .now the new one blows cold air in and its still working fine

BigBudBalls said:

just my 2cents, but I rather push. Reason being it gives more molecules at the light to absorb heat. Now some may say the push will compress the air raising its temp, but the light is going to raise it anyways.

(also my fan has plastic blades/impeller, so rather not have the hot air on that)

But all in all, I don't think it really matters

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That is a good explanation on why I settle on pushing when I am faced with which to choose. Thanks

dube said:

i had a fan pulling hot air out from a duct to the cool tube and drawing [from a duct] fresh air in but the fan did not last 12 months it over heated .now the new one blows cold air in and its still working fine

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buy a descent extraction fan and mount it properely and its everlasing.
LUDACRIS.

ludacris, i am still confused, i kept reading your posts and its all correct, but he is cooling a cooltube, totally sealed off from the grow room enviroment, yes having your hot air exhaust at the top of room for heat and humidty control, but thats not the question here, bigbudballs said he didnt like the idea of having hot air passing over and thru his fan, he is correct about that, every proper setup i have seen whether independant from grow room enviroment or with carbon scrubber attatched always had Filter->>Fan->>Tube/Hood->>out the room, i run my carbon filter seperate from the colling system, and i run several lights inline, i always prefer fresh air>>hood>>exhaust out....in these setups we arent totally cooling cus you still will get some heat , we are just trying to shuffle the added buklb heat out of the room

ludacris, i am still confused, i kept reading your posts and its all correct, but he is cooling a cooltube, totally sealed off from the grow room enviroment, yes having your hot air exhaust at the top of room for heat and humidty control, but thats not the question here, bigbudballs said he didnt like the idea of having hot air passing over and thru his fan, he is correct about that, every proper setup i have seen whether independant from grow room enviroment or with carbon scrubber attatched always had Filter->>Fan->>Tube/Hood->>out the room, i run my carbon filter seperate from the colling system, and i run several lights inline, i always prefer fresh air>>hood>>exhaust out....in these setups we arent totally cooling cus you still will get some heat , we are just trying to shuffle the added buklb heat out of the room

i dont know why it double posted, anyhows, you guys are talking plastic blades, i think your using duct fans, these are good to cool a single 400 or 600watter, but having this type of fan at the end of the system will burn out, or at the very least need to be oiled up every few months, whichever way you feel comfortable putting your fan, invest in a proper fan and it wont let you down. Personally i use HTG's 6inch growbright fans and they been in service for a year now nonstop and keep on truckin

morrisgreenberg said:

i dont know why it double posted, anyhows, you guys are talking plastic blades, i think your using duct fans, these are good to cool a single 400 or 600watter, but having this type of fan at the end of the system will burn out, or at the very least need to be oiled up every few months, whichever way you feel comfortable putting your fan, invest in a proper fan and it wont let you down. Personally i use HTG's 6inch growbright fans and they been in service for a year now nonstop and keep on truckin

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not to sure what you mean but as for the best extraction fans keep rucking mate.
http://www.greenshorticulture.co.uk/Growroom-Products-20/-In-Line-Fans-Fan-Filter-Deals-108/RUCK-Fans-101.asp

LUDACRIS.

morrisgreenberg said:

ludacris, i am still confused, i kept reading your posts and its all correct, but he is cooling a cooltube, totally sealed off from the grow room enviroment, yes having your hot air exhaust at the top of room for heat and humidty control, but thats not the question here, bigbudballs said he didnt like the idea of having hot air passing over and thru his fan, he is correct about that, every proper setup i have seen whether independant from grow room enviroment or with carbon scrubber attatched always had Filter->>Fan->>Tube/Hood->>out the room, i run my carbon filter seperate from the colling system, and i run several lights inline, i always prefer fresh air>>hood>>exhaust out....in these setups we arent totally cooling cus you still will get some heat , we are just trying to shuffle the added buklb heat out of the room

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this makes no sense to me there is no need for cooltubeing lighting fixtures or carbon filters if you exhaust the growroom efficiently.
LUDA.

morrisgreenberg said:

ludacris, i am still confused, i kept reading your posts and its all correct, but he is cooling a cooltube, totally sealed off from the grow room enviroment, yes having your hot air exhaust at the top of room for heat and humidty control, but thats not the question here, bigbudballs said he didnt like the idea of having hot air passing over and thru his fan, he is correct about that, every proper setup i have seen whether independant from grow room enviroment or with carbon scrubber attatched always had Filter->>Fan->>Tube/Hood->>out the room, i run my carbon filter seperate from the colling system, and i run several lights inline, i always prefer fresh air>>hood>>exhaust out....in these setups we arent totally cooling cus you still will get some heat , we are just trying to shuffle the added buklb heat out of the room

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as you can see a basic growtent exhaust at the top and intake at the bottom i could find another 100 pics but i am too boned and dont feel like arguing.
http://www.greenshorticulture.co.uk/Grow-Tents-353/Dark-Room-Grow-Tent-Packages-485/Dark-Room-Street-DRS120-Grow-Tent-Package-1216.asp

LUDACRIS.

LUDACRIS said:

this makes no sense to me there is no need for cooltubeing lighting fixtures or carbon filters if you exhaust the growroom efficiently.
LUDA.

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You speak in absoloutes.
There are a million ways to set up a growroom. What works for me doesn't always work for you.
Are you stating that air cooled reflectors are never a part of an efficient growroom? or carbon filters?
Please clairify, because it sounds like you're off your rocker.

SpruceZeus said:

You speak in absoloutes.
There are a million ways to set up a growroom. What works for me doesn't always work for you.
Are you stating that air cooled reflectors are never a part of an efficient growroom? or carbon filters?
Please clairify, because it sounds like you're off your rocker.

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yes i am stating that air cooled reflectors are exellent for an efficient growroom but not by the use of a cool tube set up and there is no benefit to plant growth by installing a carbon filter to your exhaust or a cooltube to your lamp.
filters are only in place to dissapate smells/oudours and cool tubes are in place to cool the lamp.
now tell me how installing a carbon filter or cool tube is going to better my yeild.... and how will a cooltube make my lamp any cooler than it is with a fan blowing on it .
and yes i am totally off my rocker as you say and i dont see that as relevant unless you have a different view.
LUDA.

LUDACRIS said:

now tell me how installing a carbon filter or cool tube is going to better my yeild.... and how will a cooltube make my lamp any cooler than it is with a fan blowing on it .
LUDA.

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Well with a cooltube working properly, you can have your canopy closer to the bulb and not get plant burn.

The heat that is given off by the bulb generally stays inside the cooltube, and then gets pushed or pulled out of the grow closet. The heat will have less impact on the ambient temperature of the grow closet.

Having a fan blowing on your lights just spreads heat around your closet, but the heat will be taken out of your closet by the exhaust fan.

Well my hood (not cool tube but basically the same.) gets it's air from outside the room and exhausted outside the room. The light air and room air never mix. So the light cooling is separate from everything else.
I have no filters/scrubber. I do have circulation fans exclusive of the light/hood cooling.

My point was the # of air molecules to absorb therms/BTUs as it passed by the bulb. At a negative pressure, its less, if positive pressure its more.

morrisgreenberg said:

ludacris, i am still confused, i kept reading your posts and its all correct, but he is cooling a cooltube, totally sealed off from the grow room enviroment, yes having your hot air exhaust at the top of room for heat and humidty control, but thats not the question here, bigbudballs said he didnt like the idea of having hot air passing over and thru his fan, he is correct about that, every proper setup i have seen whether independant from grow room enviroment or with carbon scrubber attatched always had Filter->>Fan->>Tube/Hood->>out the room, i run my carbon filter seperate from the colling system, and i run several lights inline, i always prefer fresh air>>hood>>exhaust out....in these setups we arent totally cooling cus you still will get some heat , we are just trying to shuffle the added buklb heat out of the room

Click to expand...

gotta say, I use a 1,000w in a closet of appx 7sq ft, exhausting a cooltube into the attic behind the closet w/ an air conditioner in the room. 1,000w would normally cook everything, especially with 80 deg days, but I exhaust the heat created by the lamp and the natural flow into the closet is from the reservoir of cool air I reside in. works pro.

now if I use the 400w light in the tube I want to blow in to the room and mix that warm air with the a/ced air to get a nice comfy temp. this also keeps the temp in the rest of the house down because the attic is allowed to properly cool. Either way I'm pulling air from the cooltube and directing heat elsewhere, the point is to remove the excess heat, and in 1,000w applications this is pretty key.



Oh and if it wasn't answered, the reason pulling is more efficient all has to do with Bernoulli. There is a low pressure zone in the fan area no matter what. If you are pulling, the low pressure zone is directed out into an open area and air is not constricted. when pushing into the duct, however, the low pressure zone is followed by the higher-pressue air travelling at lower velocity until the end of the tunnel. Ideally you push and pull and remove as much pressure from inside as possible, but with only one fan it will accomplish more pulling air from the duct.

LUDACRIS said:

now tell me how installing a carbon filter or cool tube is going to better my yeild.... and how will a cooltube make my lamp any cooler than it is with a fan blowing on it .

Click to expand...

cooltube is made so you take the heat created by the lamp and direct it elsewhere, out a window, in a different room, in an attic, to a basement, to a sewer system. it just removes the heat very efficiently. also, it is reasonably small and good for vertical applications.
it improves yield because you can place a 1,000w as close a 1 ft away and closer with a more powerful fan. minor loss of light to the glass interface, but same deal with an air cooled glass lens reflector. open air cooled reflectors take air from the entire chamber and will interrupt CO_2 if it is added, so you don't want to use open reflectors for air cooling anyways, thats why I invested in a cooltube, its all about isolating each component's problems.

depends on the application... pushing works better for feeding air into a space.. pulling works best for venting air out of a space. the ideal setup would be one fan pushing cool air in down low, and another fan pulling hot air out up top

i always have one pulling air in and one pushing air out

Can you give some more sample question and answers. How great your info is! It really useful for me. Thanks.

Can you give some more sample question and answers. How great your info is! It really useful for me. Thanks.
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I have been researching this issue for months, and I'm still confused, because everybody does it different. Ludacris, how would you set up the exhaust if you are in a basement? My intake has to come from either a window or a spot under an addition, which would be ceiling height. Do I take the vent and drop it down to the floor? Or just take the intake in a straight line with the 2 1000 w air cooled fixtures, then stay ceiling height and continue w/exhaust?

passive intake, light , light ,fan ,carbon filter, exhaust into 2nd room to help heat my house in the winter? I have an elicent 8" fan, and am buying 8" ductwork. My intake has to be bigger, so I need 10" at the intake, then reduce to the 8" light fixtures?