passive intake

These are part of my passive intake. I added two at the beginning because I didn't know how I was going to set things up and it'll give me options down the road. Used killz paint then paint the inside black. I have ez flow filters on the outside hoping to upgrade to a true HEPA.

Im planning on using 4x4 tent with 1000w aircooled HID.........Ive heard that i dont need intake fan just run passive intake through hole towards bottom, but i also heard passive ok but fan better. For me I like the idea of less noise and less cost thats for sure so passive sounds ideal but i...