2005 hummer h2 4 18 inch fi btl fully loaded

[Joe Bouney 0]

Could someone guide me on what size enclosure would be correct for the four of these big bad subs.They are 18 inch btl fully loaded. The customer would like a wall. The ruff dimensions are 35 inches tall, 45 inches wide, and @26 inches deep. Any help with the vent width,hieght,and length would be great.