You can use an inline fan hooked up to a carbon filter to circulate the air through the filter in the room without having to exhaust it. Or perhaps some ONA or other odor nuetralizing product. You can also look into ozone emitters for smell.

If those plants arent even budding yet then imagine what the smell will be like in about 4-5 weeks.

There are also many DIY threads on homemade odor control if you look around.
GetThisOrDie Reviewed by GetThisOrDie on . Options for Odor Control! Please Help! Okay, so I have 4 plants going it a small room in the basement. Today it has been eactly a month since they have sprouted, and they are starting to smell. I dont want to build a big grow box with an intake and an exhaust, are there any simpler options? Rating: 5