Carbon filter I need Help

hey there RIU, i can't find a way to push air through the fan to go through carbon rocks, i'v tryed sucking air through carbon rocks. How dose everyone else operate carbon rocks with pc fans? i need help with this one, i'v tryed some ideas, and none have worked, my g boxes a 2'x2'x4.

i use a 10" Honeywell power efficient fan to suck the air out.

I would recommend using the highest CFM PC fan you can get your hands on. Next i would use less carbon in the filter.

The carbon in my filter is 1 1/4" thick. i think a 90cfm PC fan could push through a small beercup size carbon filter thats around 1/4" thick.. possibly

This is cheap and 87cfm
http://www.newegg.com/Product/Product.aspx?Item=N82E16835200021

Something like this would work. BUT Walmart in my area no longer sells the larger version of the cup.

https://www.rollitup.org/do-yourself/101248-best-diy-ez-walmart-carbon.html