Scrubber CFM requirement

[LyryC]

For a 470 CFM rated Scrubber is a 300 cfm blower too weak to use to pull air through the scrubber thru the hood and then out the room?

OR would the 300 cfm blower be too weak to push air out of the carbon scrubber?

I have a nice 300 cfm blower and need a scrubber soon and I can also get a 310 cfm rated scrubber and I have a 240 cfm exhaust fan that I could use to pull air through the scrubber through the light and out the vent.

I want the 310 scrubber and 240 cfm duct exhaust fan set up because that way I can knock down smell and light ventilation simultaneously.

Much appreciation on the time you are taking to help me everyone.

 

[qupee]

300 cfm fan is not too small for a 470cfm filter, no.

 

[señorsloth]

don't worry, imo, those minimum numbers are b.s.

the bigger the filter, the more surface area it has, this is why bigger filters can handle higher air flow, if you were to take a filter rated for 100cfm and blow 400cfm through, you would not only find that the air would get backed up, but the air coming out would be forced through the carbon too fast so that it didn't get a chance to be scrubbed. thats why it's important to never run a filter that is too small for your airflow, carbon contact time is very important.

however, reverse that and blow (or pull)100cfm through a filter rated at 400cfm and it just means it has more surface area, so more holes for air to escape, it takes less resistance to push 100cfm through a filter rated for 400cfm than it does one rated for 100cfm...not a lot easier but it is easier, the real key is the carbon exposure time...your smelly air is going through the filter 4 times slower than the filter is rated for so the air is in contact with the carbon for 4 times longer than it's rated and all the while with less energy needed to push through it...

that is why i have always advocated using a filter that's oversized for your fan, they last longer and your fan will last a little longer too because it's less work to push air through a bigger filter, and the air comes out cleaner as well...

 

[LyryC]

Thanks Senorsloth, Im going to have a 240 rated fan pulling through the filter and out the lights and exhaust vent. I'm going to buy a speed controller to lower the speed of the fan and then couple it with the 310 cfm scrubber.

 

[Hydrolized]

I usually use filters rated for double my fans rated cfm @ .75" W.C. which is the average static pressure a filter will put on the fan at its listed cfm rating

 

[sherm]

Thanks guys ,this has help me out a great deals . thanks again .

 

[J-zee]

Id say max cfm rating for filter so it does not pass thru too quick n not do its job... That would be my only fear... Small fan big filer, = no problem


Big fan small filter. =Problem.