just starting out could use some tips

I got a 9 pot areo from bontanicare and a 1000w mh. I have a 4x6space to grow. one question is can i just push cool air in and not have to exhaust to try and keep the smell down? any advice is appreciated.

Not sure what you mean. The air has to go somewhere or you have just created a balloon.

true so what is the best way to keep the smell down?

smokin it said:

true so what is the best way to keep the smell down?

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Carbon filter! Works like magic. Search around for that.