im about to set up a closet grow. the dimensions are2.5' x 3.5' with 9ft ceiling. i want to put a 300watt hps in. my question is how would i set up exhaust and bring in fresh air to the closet while keeping it semi-stealthy? i also would need to scrub the exhaust air. the bottom of the closet door has a decent gap so the closet isnt airtight. thx in advance for any suggestions