This is a white 6" wall-mounted kitchen exhaust fan, likely from a brand such as Futina or a generic equivalent.
Design: It features a square casing with a circular fan housing containing six white blades and a central cap.
Usage: These fans are designed to remove hot air, smoke, or odors from kitchens, bathrooms, or restaurants.
Specifications: Similar models are available in various sizes (typically 6-12 inches)