I've been thinking about building my own grow box and have must of it though up but I'm a little stumped on how exactly to build an air tight seal for a door. I've found some nice cabinets and Armoire's but I don't know how I'd go about either creating an air tight seal with a door that comes with it or making a secondary "door" inside with either some velcro or magnetic strips. I'd prefer to use magnetic strips rather than velcro. Does anyone have any ideas how I could make an air tight seal either our of an Armoire cabinet or making a secondary door?