Vent grommets are a good idea and will also allow the drawer to close easier (allows another way to "squeeze" the air out). Until I added them to my FJ drawer units, the drawer would make a fluttering/fart sound when closing it.
2008 Sandstorm FJ Cruiser, Level 8 Guardians, Cooper STMaxx LT285/75/16E, Radflo suspension, Total Chaos UCAs, BudBuilts, Exp One w/Superwinch 9000s, BajaRack, Dual batteries, MetalTech upper and lower links and more
I'm the Woodsman, the four-wheelin', tree-farmin', custom-furniture-makin' descendant of Olaf "The Woodcutter" Ingjaldsson.