i was thinking about this myself but i find that to be a bit of an issue due to security reasons,i dont want a big ass light coming out of my garage.i wil ltry to get this shit vented asap.waiting on some money..
Venting is the first thing I thought when I looked at this and others have already pointed it out. What you need to keep in mind is that one day you will flower. When that day comes you are going to need to use a carbon filter. This page should give you an idea, the prices are in the ballpark for what you should be looking at on filter and fan. http://htgsupply.com/products.asp?categoryID=9&subcategoryID=29