History - Grow cabinet in the making, 400w HPS in a cool tube being ducted out using 150mm ducting First Q is what is the best way to attach mylar to the inside of a metal cabinet, i don't want this falling down !!! Would Velcro strips work or a double side adhesive tape? 2nd Q is silicone the best way to air-tight a cabinet ? 3rd Q is what is the most effective design for a passive intake or 2 for a cabinet. So far i'm going to cut 2 holes in the side of the cabinet (towards the bottom of course) and run a length of black ducting to cut any light leaks as well. Is this sufficient? Thanks.