spacegh0st
Member
So i decided to get a bathrrom fan as my micro cabs exaust. The only way i can get a filter is through the end. Would a push work as good as pull filter?
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push vs pull
- Thread starter spacegh0st
- Start date
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Member
For some reason I was very opposed to pushing out of my filter. Then I came to a point where it just wouldn't make sense to pull through it anymore. Since I've started pushing I've notice no negative side effects. I've only been doing it for about 6 months though so I can't really say how it impacts the life of the filter, fan or anything like that. I can't see it really being that bad though.
JOE CHRONIC
Member
spacegh0st
Member
I keep hearing its because pressure build up. But a, lot of people push and don't have negative consequence
Pulling gives you better air flow if there are any impediments to the flow - the problem areas will disrupt the flow less. It is also better to keep air leaks from letting stinky air out. That said, I have one application where it isn't possible to set it up any other way and pushing has been working just fine for a couple of years. I did put filter material over the air inlets because the pre-filter that comes with most carbon filters obviously doesn't help if the flow is going the other way through the filter.
oneshot
Active member
Have you ever tried cutting the filter and putting it inside? I know the Phresh filters can be fit inside for this type of application.
No, it was an easy setup to put them on my air intakes, so I just went that way. I figured it would also keep bugs, etc out.
pushing through filters doesn't work as well as pulling, as far as suction strength is concerned, obviously the filter will work fine either way.
that being said i have a panasonic wisperfan 190cfm(bathroom fan) and mine is setup to push, by doing this i can keep the filter on top of my cab and out of the flowering chamber, saves a lot of space, i also converted the intake on my fan to fit directly to my glass cool-tube, this way, my setup is not only very compact, lightproof, and quiet, it's also actually the BEST way to hook up a filter in my setup, meaning i get the most suction this way because i eliminated 100% of all my ducting and by putting my filter on the outside, i was able to use a much larger filter than i could fit inside the flowering chamber(bigger the filter, easier the flow)and eliminate a HUGE cardboard light trap i had covering the exhaust... also were it inside it would be absorbing a lot of light and blocking some of my plants partially...
I've tried about 10 different setups all together in the last year and settled on this one 2 harvests ago, i don't think i'll ever change it... so for me at least pushing through the filter is definitely the best way.
that being said i have a panasonic wisperfan 190cfm(bathroom fan) and mine is setup to push, by doing this i can keep the filter on top of my cab and out of the flowering chamber, saves a lot of space, i also converted the intake on my fan to fit directly to my glass cool-tube, this way, my setup is not only very compact, lightproof, and quiet, it's also actually the BEST way to hook up a filter in my setup, meaning i get the most suction this way because i eliminated 100% of all my ducting and by putting my filter on the outside, i was able to use a much larger filter than i could fit inside the flowering chamber(bigger the filter, easier the flow)and eliminate a HUGE cardboard light trap i had covering the exhaust... also were it inside it would be absorbing a lot of light and blocking some of my plants partially...
I've tried about 10 different setups all together in the last year and settled on this one 2 harvests ago, i don't think i'll ever change it... so for me at least pushing through the filter is definitely the best way.
Persephone
Member
Matched fans are the go, one up high pulling, the other down low pushing.
Never noticed any real difference between the two as far as performance. Taking that into account, I generally push since the filter muffles the fan at least.
I always put the fan close to the filter when pushing, preferably a direct connection with no ducting, and ensure I have an immaculate seal.
I always put the fan close to the filter when pushing, preferably a direct connection with no ducting, and ensure I have an immaculate seal.
They were designed to pull through, hence larger surface area on the outside
Phat became Rhino about 3yrs ago, so start looking for a new one, the warranty was for 2yrs but they last 3+ yrs .... just
Replacement socks for them are obtainable from the manufacturer, so your store should be able to get them ....... changing that about once a year keeps the air flow about the same as it should be
BTW good to see someone taking ventilation seriously
Nonphixion
Active member
I was under the impression that squirrel cage fans, like a Dayton, pulling would be an order of magnitude less effective than blowing through a filter.
HeathBanks
Member
Pulling is almost twice as efficient as pushing. Especially when it comes to carbon filters. Look at the can filter labels. The max exhaust (pushing) cfm rating is always half of the max scrubbing (pulling) cfm.
Nonphixion
Active member
I understand that for a carbon filter it makes much more sense to pull through it. With my limited experience with the Dayton it seems like it had more success pushing through longer duct runs (6') than pulling through it. Just using my hand to feel the output the difference was significant. I could be wrong though, that test wasn't quite that scientific.
Your not reading the label correctly. It has nothing to do with pushing or pulling. Scrubbing is recirculated filtering.
Scrubbing is when you sit the filter on the floor with a fan on the top of it just recirclating scrubbed air back into the room. Exhausting is when you run ducting awy from the filter and fan to outside the room.
The reason the scrubbing cfm is lower is because there is no resistance with the fan just blowing back into the room.
The cfm is higher when exhaustion because of the ducting.. which quickly slows down a fan.
Lastly.. if carbon filters when meant to PUSH air through them, the pre-filter would be on the inside, not the outside. On the outside.. that would make it a Post-filter and achieve NOTHING. The pre-filter is there to clean the larger particles out of the air so they don't clog up the carbon making it go bad faster.
The reason the scrubbing cfm is lower is because there is no resistance with the fan just blowing back into the room.
The cfm is higher when exhaustion because of the ducting.. which quickly slows down a fan.
Lastly.. if carbon filters when meant to PUSH air through them, the pre-filter would be on the inside, not the outside. On the outside.. that would make it a Post-filter and achieve NOTHING. The pre-filter is there to clean the larger particles out of the air so they don't clog up the carbon making it go bad faster.
