intake venting question

How do I vent the intake so it's light proof say thru a wall.I have the exhaust worked out but not sure on the intake for my air/lighttight 6'x6' bloom room.Looking to vent thru the wall close to the floor but dont want ducting showing outside the grow room.

couldn't you intake from the near top of the room?

Would rather vent close to floor so the air gets sucked up thru the room.Just read db's journal and he was kind enough to show a pic of his intake.Should work in the space I have to work with.