yeah the scrubber will attach to a a fan, best way is to pull the air through the scrubber and out the fan, so u mix the air up as it cleans.
scrubber - fan
[ ]---->{}--->

I say its the best way becuase your forcing the air in the room to be cleaned, opposed to a gel or something that will work but only so much.

Theres a DIY on how to make a scrubber for like 20bucks, u can pick up active carbon at a aquarium store like petco, and the fan will be less then 20 for an inline 4" fan. Will sound be an issue?