12mm

Hello there. I need some help with my dresser grow box. My dresser is 27 x 30 x 13 (Width x Height x Depth). I have 4 x 12mm, 1 x 10 mm, 3 x 8mm PC Fans. I don't know their power or CFM. The bigger the more air it blows. I am planning on build a 250w CFL grow, 10 or 8 cfl light bulbs. No...