Nutone!
Travis:
The diameter of your wall sleeve suggests a Nutone fan. These were wired-in fans; there were models controlled by a wall switch, and the more common chain-control models. The chain control models had a pull chain on the front grille of the fan; when you pulled on it, it opened the damper door of the fan and turned it on. Pulling again turned the unit off and closed the damper.
While Nutone still makes these fans, current models have a cheap-ass (there, I said it!) plastic grille that is not only wrong for your house's period, it's difficult to keep really clean-looking, since plastic discolors when exposed to grease and fumes, which are, after all, what a kitchen fan is designed to deal with.
You're going to have to go vintage, which means eBay or CL or lucky finds elsewhere. Below is a photo of the Nutone fan I grew up with, the Model 8170. It was a pull-chain model. There have been many Nutone models over the years, and you may find others with grilles you like better for the style of your house, but this is the unit I'm familiar with and can recommend highly.
Just so's you'll know, these fans have to be wired into the wall. Inside the sleeve part of the fan, there is an outlet which is connected to the wall wiring; you can unplug the motor from the outlet so the motor/blade assembly can be removed from the sleeve for cleaning. Nutone thought of everything in those days; how I wish whoever decided plastic would be perfect for a kitchen fan grille thought that way today.
Hope this helps!
