Intake newbie question.

Can I have Intake from outside my window?
Even if the weather is cold. I mean mid 40's during the day and 30's at night?
I would appreciate any advise.

Thanks.
 
I'm using one cfl 42w 2800 lumens.

And i'm using a cardboard box don't know the exact size I guess i should figure that out. lol...
I'll get back to you on the size of my box.
But i was thinking of using a duct from outside my window to my box?
And then having a carbon filter for my exhaust.
 
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