Reply #6: Looks like

[Wash. state Desk Jet]

to the left and right of the room small square vents will fit. And it would not look bad at all. Opposite end the same .So six vents perhaps. 5"by 6" or 6" by 8" vents ,something like that in dimension. What do you think? Looks like the house is gray or blue gray with white trim so white vents would work well and blend in. Or Spray paint the vents the same color as the house. But if the trim is white white would be fine. I'm thinking aluminum which comes in white ,bronze,brown and black. But than there is unpainted wood vents too. vinyl also. You can also find designer vents in wood. I can't see the soffits that may be another avenue to venture down.