greenjeans
Hydroponic Heretic
So I just came across some information about carbon filters that I have never seen before. Upon researching it further, it appears that it applies to all filters, and not just the brand I bought.
The cfm rating of a filter is based on a sealed environment with the fan and filter working inside. In other words, a 400cfm filter is rated to perform in a sealed room filtering the same air multiple times.
The "single pass" rating of a carbon filter is actually 1/2 of this max cfm number. So if you buy a 400 cfm fan and a 400 cfm filter, and you plan to exhaust the air inside the room through the filter and outside, this "single pass" number is the rating you are supposed to use.
So really, in this single pass type setup, your filter should have a cfm rating of double your fan rating.
Apparently, this info is right on the front of the Can-Filter packaging, and I ran into it by accident. I then immediately went searching to confirm, and can't really find any mention of this information anywhere useful. I found one Youtube video that discussed it briefly, and it is also on the Phat filter website, which is the brand I bought.
Can anyone confirm or refute the accuracy of this? I already purchased a 4" 190cfm fan, and a 4x12 200cfm phat filter. I did get the speed controller, but does this mean that I will have to run my fan at half-speed to really kill the odors? Surely someone knows all of this stuff really well in here.
The cfm rating of a filter is based on a sealed environment with the fan and filter working inside. In other words, a 400cfm filter is rated to perform in a sealed room filtering the same air multiple times.
The "single pass" rating of a carbon filter is actually 1/2 of this max cfm number. So if you buy a 400 cfm fan and a 400 cfm filter, and you plan to exhaust the air inside the room through the filter and outside, this "single pass" number is the rating you are supposed to use.
So really, in this single pass type setup, your filter should have a cfm rating of double your fan rating.
Apparently, this info is right on the front of the Can-Filter packaging, and I ran into it by accident. I then immediately went searching to confirm, and can't really find any mention of this information anywhere useful. I found one Youtube video that discussed it briefly, and it is also on the Phat filter website, which is the brand I bought.
Can anyone confirm or refute the accuracy of this? I already purchased a 4" 190cfm fan, and a 4x12 200cfm phat filter. I did get the speed controller, but does this mean that I will have to run my fan at half-speed to really kill the odors? Surely someone knows all of this stuff really well in here.
