pull or push air through scrubber

[Hammerhead]

blowing just clogges it up faster. You can use it like that it just wont last as long.

 

[nut]

blowing just clogges it up faster. You can use it like that it just wont last as long.

why wont it last as long? if you put the pre filter over the hole where the ducting connects to the filter to stop dust then it makes no differance what way the air flows through the carbon. Although its better to pull through the filter in general its not always the best.

E.g If you use air cooled hoods by pulling air through the filter that is at the end of the hoods any air that is sucked in through the cracks in the hood because of not being air tight will also carry the smell that the filter does not have time to scrub.
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@OP
The Idea is to have NO SMELL leave the room/tent it does not matter whether you blow or suck as long as the smell does not leave the room = why we use the filters in the first place.

Put a pice of prefilter over the open end of the carbon filter use a zip tie or rubberband to hold it then connect you ducting and fan ect.. as pointed out removing the smell is your priority both methods work.

 

[Hammerhead]

If you can get that pre filter in there a work properly then sure but I doubt very seriously you can. You will also blow carbon dust into your flower room. Wont hurt anything just makes a mess.

 

[the Rock]

pull

 

[nut]

If you can get that pre filter in there a work properly then sure but I doubt very seriously you can. You will also blow carbon dust into your flower room. Wont hurt anything just makes a mess.

the carbon filter is outside of the tent so it will not blow anything in to it, Cut a pice of prefilter place it over the end of the hole it does not go in side the filter! all the dust is trapped before it goes in to the filter. you might have to use bigger ducting e.g size bigger to fit over the prefilter, but thats also a good thing = less noise better air flow.

 

[Panama Red]

Pulling through a cylinder shaped (can) filter is more efficient on several levels.

1-You're drawing the air through more square inches of carbon when drawing from the outside/in.
(Think outside circumference vs inside circumference)

2-Creating a negative air pressure situation eliminates the possibility of forcing unfiltered stank out of cracks in the cab that you missed. (Yes you missed cracks einstein!)

3-Live it, learn it, stop the crispy conjecture.......

 

[Hammerhead]

Ya I run mine the correct way. You guys can DIY all you want. I wish you the best of luck

 

[Lazyman]

Any HVAC tech with a brain will tell you centrifugal fans are more efficient when pulling a load than pushing a load.

 

[designer]

power is power. It takes the same power to push or pull and the fan impellers and motor will not see any difference. But when you pull you bring everything in, leaks and all. When you pull you will pull around via leaks any resistance down stream (i.e. filter). You will have a better outcome pulling.

 

[statusquo]

Hiya. Are we talking 4 times more efficient in terms of the fan, not the filter? I hope so.
Edit: what I meat to say was, are we saying that the fan functions 4 times more efficiently if we pull through the filter? Not that the filter fiters better, right?

I think it means the fan will move 4 times the amount of air compared to pushing. Makes intuitive sense too IMO.

 

[tr1ck_]

power is power. It takes the same power to push or pull and the fan impellers and motor will not see any difference. But when you pull you bring everything in, leaks and all. When you pull you will pull around via leaks any resistance down stream (i.e. filter). You will have a better outcome pulling.

The motor will definitely see a difference, it isn't near as efficient by a long shot to push, so the motor will be have a lot of extra resistance to spin at the rpm's it was designed for. Its a good bet that you fan will flow considerably less, and burn out faster, also it can be argued that the filter will perform slightly worse since you are blowing from the smaller circumference to the larger circumference.

 

[nut]

The motor will definitely see a difference, it isn't near as efficient by a long shot to push, so the motor will be have a lot of extra resistance to spin at the rpm's it was designed for. Its a good bet that you fan will flow considerably less, and burn out faster, also it can be argued that the filter will perform slightly worse since you are blowing from the smaller circumference to the larger circumference.

Sir isaac newton's 3rd law was wrong then?

To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions.

 

[greenmatter]

both would work but if the pre-filter is on the outside i would say it is designed for PULL ... i would use it like the guys who built it wanted you to.

 

[nut]

this should make it clear if Newtons Law is correct.
If you push or pull on somthing you will have the same force act against you in our case a fan and filter they should both move the same amount of air in both directions sucking or blowing

 

[greenmatter]

this should make it clear if Newtons Law is correct.

and does newtons law explain cfm loss in an elbow. not saying newtons law does not apply at all but the apple falling on your head and air movement is apples and oranges.

 

[nut]

and does newtons law explain cfm loss in an elbow. not saying newtons law does not apply at all but the apple falling on your head and air movement is apples and oranges.

if you have the same elbow and ducting or what ever in the way it will be the same if you switch the fan around be it sucking or blowing.

 

[greenmatter]

if you have the same elbow and ducting or what ever in the way it will be the same if you switch the fan around be it sucking or blowing.

not really pushing and pulling air is two different things. which end of the ducting the fan is on DOES make a difference. google it

 

[Scrogerman]

It depends on the filter(brand), these days you can get some that are designed to do either, be it pulled or pushed through! Look into it bro! This can be handy to know if you wanted to push through, just find the compatible filter. (Rhino/Phat are supposed to be compatible so i believe). Sealed ducting(100%) would be pretty important though, thats where problems occur running that config!(i do it all the time btw) i also recommend you slightly over size your filter, works for me!

 

[greenmatter]

It depends on the filter(brand), these days you can get some that are designed to do either, be it pulled or pushed through! Look into it bro! This can be handy to know if you wanted to push through, just find the compatible filter.

 

[nut]

not really pushing and pulling air is two different things. which end of the ducting the fan is on DOES make a difference. google it

Ok then Newton was wrong all along! for the past 200+ years physics have used this law to put man in space stop satellites from falling to earth and explain why airoplains stay up in the air and why boats float ect.. but when it come to Grow room ventilation its all BS.