Convection system for employment with an RF oven

An oven comprising:

• a cooking chamber configured to receive a food product;
• and
• an air circulation system configured to provide heated air into the cooking chamber,
• wherein the air circulation system comprises:
• a plenum separated from the cooking chamber by a back wall of the cooking chamber,
• an airflow generator configured to draw air from the cooking chamber through a chamber outlet port and discharge the air into the plenum, and
• an air heater configured to heat at least some of the air in the plenum prior to a portion of the air entering the cooking chamber from the plenum via air delivery orifices,
• wherein the chamber outlet port comprises outlet perforations combining to form a first geometric shape centered on an axis of the airflow generator,
• wherein the air delivery orifices comprise a first set of inlet perforations disposed near a top wall of the cooking chamber and a second set of inlet perforations disposed near a bottom wall of the cooking chamber, each of the first set of inlet perforations and the second set of inlet perforations comprising individual rows of perforations that extend linearly along a direction substantially parallel to a plane in which the bottom wall or the top wall of the cooking chamber lies, the first set of inlet perforations and the second set of inlet perforations combining to form respective second and third geometric shapes that are disposed on opposite sides of the outlet perforations,
• wherein the second and third geometric shapes are different than the first geometric shape,
• wherein a number of the individual rows forming the second set of inlet perforations is larger than the number of the individual rows forming the first set of inlet perforations, and
• wherein a center of the outlet perforations is closer to the second set of inlet perforations than the first set of inlet perforations.