Is intake and exhaust required with envirolites(200w)?

[Lowryder1]

Intake and outlet can be at the same level, however the best is to have your intake low and your outlet high
You shouldn't need it for the heat since envirolites give off very little heat, but you do need to circulate air around the plants.

Thanks.

Will it be possible to put the intake to the top and one fan blowing around the plants inside the closet? This way I wouldn't be needing exhaust so the smell couldn't get outside the closet. With exhaust I'll be needing negative ion purifier that would cost me 50-80 euros...