fan, push or pull dillema

[rdo420]

I know this has been beat to death, I've done the search and have read probably 150-200 old posts on the subject and out of those a 100 were for pulling, the other 100 for pushing the air through the hood. I'm really at a lost. Some others mentioned that it depends on your set up. That sounds great so I'll just give a setup scenario and hopefully you vets out there can help me. Room size is 3'x4' with 8 ft. ceiling. 600w in a airoflow sealed hood. Has 6'' ports on each end of it. The fan is an htg 6'' inline duct fan nade by growbright. 160cfm free airflow, 250cfm max booster flow. The length of ducting needed to exit the room and outside is about 7ft. I know The fan is small for my needs but its all I could afford. Now that you'll have the setup, should I place this small fan at the intake or exhaust? Again sorry to bring up an old topic and thank you for any advice.

 

[LeafGnosis]

put me in the 100 for the pulling of air! When pulling air through, there is less 'resistance' than pushing the air through.. though I am sure it is not much. Either way does work so it is really up to you.

 

[chewberto]

put me in the 100 for the pulling of air!

 

[Mattemil]

PULLING.....I dont think half say to push..

 

[MI Dude]

Both. I pull out the old air with inline fans and push in fresh air with duct boosters.

 

[BustinScales510]

Definitely pulling.

 

[jrainman]

There is not a witch came first for your answer, like witch came first chicken or the egg, Exhaust is always pulled (Sucked) and supply air is always pushed (blow). it has to due with duct sizing and static pressure........

 

[AdamBlack760]

ive pulled ive pushed now i do both

 

[thinn]

ive pulled ive pushed now i do both

And that, folks, is how babies are made!

Its not going to matter either way bro, it wont blow up on ya.

 

[rdo420]

appreciate it. Just wanted to get the max out of this baby fan. Going to pull I rekon.

 

[Sampras1489]

Pulling. No doubt.

 

[neonknight420]

Same here, whenever possible pull it.

 

[pencap]

Put a carbon filter on the intake, of an inline fan, and pull hot n stinky air through the filter the exhaust side will push clean hot air out. 1c_filter + inline fan+ cooltube. " clean hot exhaust OUTSIDE!

 

[djwimbo]

appreciate it. Just wanted to get the max out of this baby fan. Going to pull I rekon.

I had it explained to me this way:

In order for heat to transfer, you need mass. This isn't the inside of your light bulb which has a vacuum.
It's easier to remove heat from a low pressure side (less mass) than from a high pressure side (high mass). Everyone looks at how the fan blows to show it's effectiveness, you have to consider where all that came from.

Think of pulling air through a heat sink instead of pushing it. HVAC on cars pull air past the blower resistors to keep them cool. Hot-wire mass air flow sensors use air being pulled through them to stay cool.

 

[dopedeeii]

Pull the hot air from ur grow area thru your Hood push In fresh air thru tha bottom of ur grow area-hot +cool

 

[colonuggs]

push and pull if using more than 1 hood

 

[nontheist]

appreciate it. Just wanted to get the max out of this baby fan. Going to pull I rekon.

Pulling is easier on the fan and may improve it's life a little that's about the only difference.

EDIT Also most carbon filters are build to pull air through hence the dust filter being on the outside.