using a carbon filter with an axial fan?

[keepleft]

hi can an carbon filter be used with a POWERFUL axial fan???

 

i know that typically carbon filters are used with centrifugal fans. however if an axial fan is extremely powerful (so powerful that your only running it on 25% capacity), would that be capable of properly and safely running with a carbon filter attached?

 

ive been told that because carbon filters create back pressure, that it can slow the axial fan blades down, but if the fan is powerful enough that would not be a problem.

 

ive also heard that the carbon can build up in the axial fan motor and cause a fire risk??? but i dont see how that would be any different to carbon building up in the centrifugal fan motor?

[thc24]

i have a 300mm axial fan that has been used on a filter it works but air flow is greatly reduced and strains motor isnt that great. I upgraded to a centrifugal can fan $$$ is much better but i also use the axial fan with out filter on a thermo time just incase room gets too hot .

 

What happens is the back pressure is too great in most filters (small carbon particals) fan spins ok but air isnt being pushed as there is heaps of room for air to avoid blades of fan.

 

Much like a bath fan in bathroom close door and window and it cavatates because there is little air being drawn through. Centrifugal fans are a totally different design all air is sucked and cant escape blades also cant pass backwards like axail fans.

 

ive seen some new fans out and about look like a centri fan mushroom shape but has regular blades and not suited to carbon filters. Is by far the best mod ive done to my grow filter/fan rated together for the size of your room.

 

 

In regards to carbon build up is not good for an $$$ fan easy fixed blow through filter rather than sucking and when filter is new give it its first start outside blowing through filter gets rid of most loose carbon.

 

About $500 is the going price for filter and fan for 3 600wts in a 1.5 x 3.5 room

Edited March 23, 2006 by thc24

[ben stone]

there is only one way to find out. hook up your fan to your filter and if it pushes the air through at a sufficient rate then its all good. If not you'll just have to buy a centrifugal fan as they are specifically designed to cope with back pressure.

 

thats assuming you already have the axial fan, if you are desciding which one to buy, go the centrifugal for sure.

 

and I wouldn't buy a ready made carbon filter if money is tight. Spend the money on the fan and make your own filter its not hard. If you did a search on the web you'll probably find instructions on how to make one if not PM me and I'll do a post on how to make one.

[thc24]

Not a bad idea Ben, Filters are the cheeper of the two no more than $150 mountain Air ( from china) fans upto $500. there is a muffler $80 that comes in handy if noise is a problem could not believe how well they work. Fans should atleast be rated for your grow box. i got one that is more than 2 times enough air flow as flower room isnt the only room being vented by this one fan. Is well worth the cash spent i did one grow without in a bedroom at a mates house you could smell weed pulling into his drive way.