yes the two ports on the bottom are for passive intake not exhaust and i wrapped a black sock with the toes cut off around it when i go into flower to keep the light from getting in. As for the smell, it is not a problem for me, i don't need to hide the smell, but if you did need to, you could make a homemade carbon filter which i beleive "Bodom" has invented or uses himself, you can find it on here, search homemade carbon filter.Also you can use the mattalic kind of dryer hose and light wont get in that way, i just had a roll of the white kind so i used it instead.Hope that helps, anything else let me know, i'm happy too help if i can.