Primo Grills Oval Heat Deflector PlatesDeflector plates are the key to turning your Primo Oval into a true multi purpose cooker. By blocking and redirecting rising heat, these plates create the indirect cooking environment needed for low & slow barbecue, two zone grilling, and consistent top down convection. Primo Oval Heat Deflector Plates Most Common Uses Two Plates on Racks: Full indirect setup for long barbecue cooks. One Plate on a Rack: Creates direct and indirect zones for two zone