A:Answer Yes it can fit a 9x13 pan if the grab handles on the ends of the pan are not too long. The measurements of the interior cooking space are: (rough measurements, NOT precise measurements) Height: 7 inches, Width: 14 inches, Depth: 11 inches. (Depth measurement is front to back measurement)
*Some 9x11 pans may fit without an oven rack to hold them if the grab handles can slide securely into the oven rack slots.
Two 9x11 pans should be able to fit if they meet the requirements to fit the interior space because there are 4 levels/slots inside the oven that can accommodate multiple pans as long as what they're cooking is not too tall/high.
If you have a metal pan that is only a little too big to fit, you can modify the pan by trimming off the excess metal on the grab handles or by folding the excess metal on the grab handles & then hammering them flat & thin. This is assuming that you want to work with pans you already own & you don't want to buy any new pans. I hope this helps answer your question.
