Unplug it and spin the blades by hand, clear any debris, clean the base connection, then reassemble and test with a little water on low. If the noise persists it is likely internal, contact support, and you can usually find the manual online with the model details.
Measure total depth including handle and plug; with 15 inches you should be fine if you can pull it forward so the rear exhaust can breathe, and smaller cavities toast more evenly with a quick preheat and one rotate. Stainless shows fingerprints while a smooth interior and slide out crumb tray clean easily if you wipe warm, and the fan is a steady whoosh around conversation level that suits a studio.
