push or pull ? air over cooltube? pic attached

i av my filter than fan attached to it then a bit of duct to my cooltube n out the tent, as this is what my man who i bought it from sugested !! is it right to push the air through, or is he rong n its best to pull the air through? thanx for any advice

I don't have a cool tube but I do have a sealed air cooled hood for my 400 watter...I personally like having my fan pull rather than push, that way you can have it closer to the exhaust, which is more efficient. Think of your air system as flowing water through pipes, water doesnt get pushed down, it gets pulled down by gravity. Your fan in this case takes the place of gravity and the air would obviously be water lol
Sorry I just smoked a pretty decent amount so I don't know if you'll understand exactly what I'm trying to say with this lol

I can see an advantage only if you're using a dodgy fan not designed for the job that can't handle the temps from the bulb.

I would disagree with what was said above. You have a big filter and it creates a large amount of friction for the air to flow through. You want the pull to be as close as possible to that restriction as possible. I have my inline fine sitting right on top of my filter pushing air over my 1000w and then out the room.

Of course man, lol, this is theopposite to what the guy at the store sed but when i look it up peeps r sayin wat ur sayin, thanx dude

Now u do it like i do norcal, but i av a hot spot n want wats most efficient !

Cues i do av a hotspot in the tube hence the question, its a brand new 5 inch fan, maybe its coz i av a bend in the duct?

I agree with NorCalTransplant.

Pushing air past the bulb saves the heat from reducing the life of the fan.

Also pulling air through a filter immediately connected to the fan, and then pushing the filtered air out prevents unfiltered air from leaking into the ducting.

For maximum efficiency cooling my HPS bulb, I use an isolated air space, solid surface ducting and no filter. The air gets pushed in, flows over the bulb, and out without mixing with the air the girls use. The solid surface ducting helps a great deal in preserving air pressure.

I use a separate, much smaller fan with a filter to exhaust (and passive intake) for the girls. The girls don't need nearly as much fresh air as that HPS bulb needs to be cooled.

Well there a number of reason to pull vs. push and they all fall down to what in the end seems like personal preference. The fans are cooled by rotation and the air they are moving through them you would have to get an ambient temp over 180 degrees before you started to do damage to most of the inline fans sold at hydrostores. When you pull air through a carbon filter is sucks the pieces in sealing up small holes and gaps in the filter, when you push through a filter the material (carbon) is pushed out of the way and can lead to holes and odor leaks. I want to say it is like adding 4ft of duct work for every 90 degree bend you put in it, and expandable ducting vs. solid has alot more resistance to it. Most people fail to take in to account the number bends and the length of ductwork they are running and end up with reduced outputs from the fans they are using. ON another note, it is possible to draw odor up through crappy connections as well as aircooled hoods, hence why some would rather push through the aircooled accessory vs pull through it. I have my set up Filter->Aircooledhood->Fan->Exhaust and I have NO odor problems with a 6in vortex and a 6x24 in Phresh carbon filter.

pazuzu420 said:

I have my set up Filter->Aircooledhood->Fan->Exhaust and I have NO odor problems with a 6in vortex and a 6x24 in Phresh carbon filter.

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While this may work for you just fine you are making your fan work harder that it has to. Stick it next to the filter and you will get more airflow out of your exhaust.

Any good hvac will tell u to pull. Negative pressure is always best. /Thread.

sensisensai said:

Any good hvac will tell u to pull. Negative pressure is always best. /Thread.

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OMCU still open Sensi?

Yes sir. Why wouldnt they be? Still stayin motivated and dedicated to keeping you educated and thus medicated.

Your setup is fine. The fan being on the other side of the cooltube isnt going to help much. Your biggest disadvantage is you are circulating already hot air from your tent through the cooltube. The only way you are going to get rid of those hotspots is to cool your cooltube seperately and have the fan and filter combo just pulling air from the tent. That way you can also better control the temps in the tent instead of it just constantly pulling air from the tent.

When people say pulling is better then pushing it is meant for intake and exhaust in general. Like if you just had an intake fan but no exhaust the positive air pressure it would create is a bad thing and it will go out the path of least resistance for the air which could be anything....also allowing smells to get out of any pin holes and zippers and what not. Also its better to pull through a filter then it is to push through the filter...filters are generally engineered to have air pulled through them anyways. The only thing i can think of that has a filter at the end of the air cycle would be like a vacuum cleaner. But wether you push or pull air through the cool tube it doesnt matter....the amount of airflow will be the same.

This is like asking a woman wether she spits or swallows it doesnt make a difference once the job gets done hehe

hi guys,
i run 3x 600watt using 3x6" cooltubes,
i tried to pull the air through the tubes but it couldnt get the temps low enough for me,
i then rebuilt the cooling using carbon filter, rvk fan, cooltube, cooltube, cooltube ,exhausted out of room
doing this resulted in 12f lower temps,

NorCalTransplant said:

While this may work for you just fine you are making your fan work harder that it has to. Stick it next to the filter and you will get more airflow out of your exhaust.

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How is the fan working harder? The are like in a 4 foot span max . To put th fan on the on the filter would take a quite a bit of work for my setup. Take a glance at it ..it is in my sig. I have as much exhaust comming out of the end of the duct as I did with it not attached to anything.

pazuzu420 said:

How is the fan working harder? The are like in a 4 foot span max . To put th fan on the on the filter would take a quite a bit of work for my setup. Take a glance at it ..it is in my sig. I have as much exhaust comming out of the end of the duct as I did with it not attached to anything.

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i believe the an would be working harder as warmer air is denser.