Filter? What size?

What size filter should I use to cool a 10x10 room? I will be pulling through the filter and exhausting into the attic. I just want to know what would be best to eliminate any and all odor?

Im gunna go to the grow shop tomorrow and get one and YOU KNOW they will recommend whatever they can profit most on (hopefully they will be honorable salesman, but there still salesman) So I would like to go in with a knowledgable mind set of what I need.

Figure out the Cubic Feet of your room so 10 x 10 x ? then figure out how many times you need to vent the room... Then get the filter that is rated for this CFM of air going through it.. From what I have read the filters don't work if air is passed through too quickly so get one rated for the proper flow and you should be good!
EX: I just got the Can Filter 9000 and for Exhaust ( Single Pass ) It needs 46 CFM so I am lucky that I have a small space and 46 CFM vents my room enough to keep it cool and not too quickly to smell (Hopefully, only tested it with a bag of stinky bud so far LoL)

thank you for that info, it definetly helps!