Carbon Filter?

Hello everyone,

I recently tried my hand at making my own Carbon Filter to attach to a Hydrofarm 4inch rated for 165 cfm. I cut a piece of four inch PVC pipe down to a foot, and attached a cap on each end.

The caps are slotted, so it allows good airflow. Directly behind each cap is a circle of fish tank filter material, and the rest of the tube is filled with activated carbon. I then attached that to the intake of my fan, attempting to pull air through it to filter my room.

The problem(?) is, not much air is coming out of the other end of the fan. I also tried blowing through the filter, and had the same result - not very much air was flowing through the tube.

My question is, where did I go wrong? What can I do to modify this so I get more airflow? I assume more airflow would be better, and I wrong?

Thanks for any help yall can give

bump. anyone out there build their own filter that performed well?

I built mine with a 190 cfm works great. I checked alot of designs and decided to go with chicken wire and panty hose

check out
DIY carbon filter for grow room part 2 & part 3

easy to build and very effective

Wolfman zens diy carbon filter I found it on riu.have a look it worked for me got my new one now so keep it in reserve.

Two mesh pencil cups and the wifes kinky black stockings(maybay to much info lol)

Thanks a lot, greehouse appreciate the help!

For 140$ I bought a ventech 440cfm and filter on amazon . Cleans the whole room . Worth every dime and penny not frustrated making one or worrying about odor

54 bucks (pounds) for all this from fantronics on eBay and that was with next day delivery.fan' filter' metal straps(3) two ratchet ties and an ona block style freshener and just installed it all and it's working perfectly oh and 5m of triple layered aluminium ducting and the fan is as mixed flow.and a roll of aluminium duct tape.

Wow Greenhouse that is a super bargain. It cost me about $75 for the parts and carbon to build my own. Wish I had spoken to you first

Pays to ask mate.