Pc Grow Case

hey im using a pc case to grow 3 plants but the case is only 1 and a half feet tall...
i was wondering if anyone would know when i should flower them so that they dont out grow the case...would a SCROG work?...i am using 2.. 42 watt cfls on 18/6 for veg...
and also how much air should good pc fans push out... cause the ones ive got dont even blow the hairs on my head... and once i start flowering im gonna need fans good enough to pull through carbon filters or this will be a problem
 
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