Well my grow space is in a attic and I was wondering that rather than having to build a grow cab that Why couldnt I take some wooden boards and just tape them with foil or mylar and then stand them in a shape of a box and hang the light from the ceiling of the attic into the area, the side pieces wouldnt be connected to each other but the would be in a shape of a box and maybe hold them together with some tape, so it would create the effect of a box. But then I have a problem with ventilation because my attic is kind of small and I cant ventilate outside my house or to any room directly, just away from the light into another part of the attic. Stealth is a concern. Will that be enough, my cab will not be air tight and I will not have to worry about light since its in a attic and there are no windows or leakages of light anywhere. Im using a 280 Watt HPS son Argo Will having walls not conectted or nailed together have an impact on odor? Since air can move in and out of the area as it pleases then a carbon filter will do no goo or will it? I mean I can place it right above the lamp so the air moves upward and to leave the area it has to move upward and then have a carbon filter attaced to it.