Push air or Pull air !

[TwoHighCrimes]

Hi Guys

Ok so just a couple of quick questions please guys !

I have 2 centrifugal fans and a carbon scrubber and ducting to fit !
My questions are : Should i pull air through the carbon scrubber or push it ?

My cold air intake source is about 15ft away from my intake hole ...should i push air from the coolroom using a centrifugal fan through the ducting and into my intake hole or should i pull air through the ducting and let air flow into the grow room !

Also guys 1 more Question

How much reduction will my carbon scrubber cause to the fan that is pushing or pulling air?... a percentage value would be helpful !
I'm really looking for a few tips to prevent the fans causing friction and creating an unstable air flow !

Opps sorry guys i forgot to add ...1 more question ..

My greenhouse is 12ft x 12ft x 10ft and my exaust fan and intake fan can move 953 cubic foot/minute yet my memory is telling me that air exchange should be 1 time every 3-5 minutes ??? My memory is'nt so good these days can someone confirm this ?? Or is it 3 times every 1 minute ??
Thanks Guys .

Peace and Stay Safe ! THC !

 

[TwoHighCrimes]

Its ok guys i found some great info from THG ..

Thanks THG .
I personally like to exchange the air in my space 2-3 times a minute. If your fan is working at max pressure it takes about a minute and a half to exchange the air in your spaceNegative pressure means that you have more outgoing air than incoming air--this is why we pull the air through the space with an exhaust fan rather than blowing air into the space. By having negative pressure, you keep the smells of the grow room from sneaking through to the outside. You can stand right next to my flowering space and not be aware that it is full of plants almost ready to harvest. Rather than adding an intake fan, you should have more passive inlets and more exhaust

 

[ShOrTbUs]

its always easier to pull air then push it

 

[Locked]

I always pull air..I never push it. It's all about the negative pressure for me.

 

[TwoHighCrimes]

Thank for the reply guys !
Pulling air it shall be !

 

[BackWoodsDrifter]

Always pull it when yur alones But when yual gots company well I reckon yual wants to "Push It" real good!

BWD

 

[oldsman]

:rofl:

 

[pcduck]

...But when yual gots company well I reckon yual wants to "Push It" real good!

BWD

Pushing it hard and far causes problems

 

[BackWoodsDrifter]

Nothin Like shaggin in the bush All I gots to say

BWD

 

[greenfriend]

i have a 8x10x8 room and im running CO2 right now, but when i convert to an open system im going to run a 1200 cfm fan attached to 6' carbon filter to exhaust the room, so air will be exchanged every 40 sec or so. (intake not passive, using 500 cfm inline fan). Using different inline fans to cool the lights.

 

[WeedHopper]

Pull

 

[jmansweed]

I always pull air to create negative pressure. Rather than blowing possible contaminated air through the seams or leaks I like to pull air through them.

 

[BackWoodsDrifter]

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BWD

 

[WeedHopper]

:rofl:

 

[applepoop911]

a pusher fan is only 80% as efficient as a puller fan.

 

[pcduck]

a pusher fan is only 80% as efficient as a puller fan.

sure you have sources to back up your data

Since you want everyone else to back their data where is yours?



:holysheep:

 

[applepoop911]

Since you want everyone else to back their data where is yours?



:holysheep:

 

[pcduck]

View attachment 199701

What the heck is that?

The first pic you found on a google search?

 

[Sparkie]

Pmsl the backup data by the looks of things

 

[TwoHighCrimes]

:rofl:

Always pull it when yur alones But when yual gots company well I reckon yual wants to "Push It" real good!

BWD

ostpicsworthless:

And that ain't gonna happen any time soon .

Thanks for the input 'err' output maybe :rofl: :rofl: :48: