Scrubbers, Suck or Blow?????

[JackReddin]

What is best?. To blow out a scrubber or suck the air through it?

 

[ItsAllOver]

I'm no expert, but I think it depends on the type of the fan used, but most of us use inline fans, for which pulling is better than pushing.

 

[LacyLePlante]

Suck for sure! Its all about the Negative Pressure!

 

[ScrubNinja]

Suck. I'm pretty sure I read there's a law of physics or whatever that supports this. Anyone know about that?

 

[Lazyman]

Some filters are only suck through, others are reversible. I've done both (even a sandwich, sucking through a CAN150 and blowing into a CAN50.) I'd do what ever is quieter or works better.

 

[FrankRizzo]

I prefer if she swallows actually.







Wait, what was the question?

 

[JustanotherDave]

Whether the fan prefers to suck/blow is a separate issue.
Standard issue canister filters perform best under a vacuum(sucked thru). But might work satisfactorily if blown into.

 

[Che]

Most filters are designed to be pulled through, or suck.. and have a pre filter on the outside. If you blow through such a filter you will reduce the lifetime of the carbon.

 

[mrred]

you can tell by the prefilter, its white, and whatever side its on thats the side air should be filtered thru first, if its on the outside, then it sucks thru it

 

[JustanotherDave]

Technically...Prefilters make no difference to the specs of the filters ability to perform under vacuum or pressure.
However...the prefilter is provided when the filter is used under vacuum. I agree in advance...99% of users will never prefilter the air before blowing into a canister carbon filter.

I have. I am in the one percentile.

 

[maryj315]

From what i understand they are rated for both scrubbing and exhausting

Jnugg has a good understanding of this he says"The can 50 set up to scrub has a max cfm rating of 840 cfm,up for exhaust a maximum cfm rating of 420 cfm. what does that mean?

It means when setting up your can filter for scrubbing to not use a fan that exceeds 840 cfm,when setting up your system to exhaust do not use a fan that exceeds 420 cfm

Mj

 

[JackReddin]

Thanks for posting. Looks like most of you are sucking.

CHE-Why does blowing through your filter reduce carbon life faster?

Also if one is using an inline fan to exhaust heat from an air-cooled hood, What would be the proper method of setting up a scrubber?

(scrubber)===>(hood)===>(inline fan)===>(exhuast)?

OR

(scrubber)===>(inline fan)===>(hood)===>(exhuast)?

(===>)meaning direction of air flow.

 

[Che]

As JustanotherDave elaborated, it's not really that they cannot be "blown through", in fact it's quite effective.. just that if you fail to Pre-Filter your air intakes effectively, (as many don't) then you'll be exposing the filter to much more debris and contaminates than necessary.

 

[BudToaster]

what size mesh should the pre-filter be?

so, without a pre-filter, washing the carbon should extend it's life???

 

[Lazyman]

No you can't wash the carbon, even humidity over 50% drastically reduces carbons efficacy and lifespan. Wet carbon is garbage.

 

[BudToaster]

but isn't the proper procedure to wash out the carbon dust (and let carbon dry) before loading into the can?

 

[JustanotherDave]

I've spoken directly with a carbon pellet supplier(I use their pellets when I refill my Cans) who's only business is commercial application air and water purification.
He said to keep humidity below 70%. At about 70% RH, the carbon starts to take a preference for moisture absorption first, odour second. He also told me that simply pulling/pushing air thru the filter, for any length of time...won't "dry" the pellet...only high heat can expel the moisture.(don't know how high)

 

[VerdantGreen]

sucking is best but if you have to blow then put the prefilter inside the tube so that the air goes through it first

V.

 

[basilfarmer]

suck!

sucking is weaker than blowing but when it sucks the air first goes through the dust filter extending the life of the filter. in fact, I take those things off and put on well sealed together high quality furnace filters = less air resisntace & more dust filtering

also air being pulled through is more keen to go into the carbon pores rather than forced blown air, the longer the contact time, the more odor removed

high mounted=== optional ozone ==== inline fan ==== air shades ====> hot moist air out
carbon can

 

[Eminem]

I have always heard sucking is more efficient. There are times when sucking is not practical though. Like in my op, we have flipped the fans to air cool the lights so that they push/blow. That way any leaks in the duct/hoods gets pushed into the room and not pulled out of the room.

heres a video where can fan states there filters can be run either way, just put a prefilter on

http://www.hydrotv.com/showhd1.html


On all my filters that sit in the room recirculating air, they pull just cause it was easy to stick a fan on and set it up that way.