to fix smell enclose your grow area.
Activated Carbon Filter (from ebay) -> Blower (totally forgot how to calculate the right CFMs for your room) - > Ducting - >Light hood -> ducting -> outside of the grow area
You can do it however you want, but you need to be filtering air through an activated carbon filter and maintain negative pressure in the room. This makes me air smell fresh and crisp. Really kinda smells like metal, but you can tell there is definitely not a plant smell.