Here is a simple and more importantly CHEAP AIR FILTER ( this for small grows ) .
I built this awhile back with good results. The commercial scrubbers can be pricey for some people ( Dustshroom and others ) but there is nothing wrong in a little ingenunity.
I have a 6" inline in a 48 " x 48" x 84 " with around 450 cfm. So this was designed for that but you can do bigger or smaller. I plan to use a variable speed INLET inline fan with a filter mod like this to introduce cleaner ( bugs , pet hair and unecessary odors ) into the tent. I have some oscillating fans that i can remove from inside with this setup.
( Egos aside from some posters , im doing this as a friendly exchange to you and whom ever would like to try it ) . Im sure somebody can add improvements or have a spin on it.
I know sometimes money can be an issue , so i think this can be quite cheap for you to try.
Parts List :
Duct Reducer - Size ( depends on inline fan size ) 4 to 6 , 4 to 8 or 6 to 8 ETC.
( another MOD can be a DUCT COUPLER ( same to same )
Hot Glue Gun
Carbon Filter Material - Carbon " Prefilter " Squares or Activated Carbon Hepa Filter ( cut ) to size. Some Carbon Filter material can be bought on a roll.
You will find this is a more compact filter instead of common canister styles.
1. Cut material SLIGHTLY oversize. In the reducer - add a few points of hot glue to SET FILTER in groove. Here is the BASE. From here you can add 1 or MORE cut filters to increase filtration. I normally do 3 myself.
2. Finish last filter with Hot Glue POINTS around filter - There is NO need to add much. Only a few area points to keep filter together.
3. Place reducer at inlet of inline or at end depending what you want it for.
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VIOLA ! CHEAP ASS FILTER !