A cooking appliance is provided that includes a casing defining a cooking cavity. The casing includes a top wall defining an aperture. A supporting member has an inner surface and defines an air channel and a sealed chamber with a first opening and a second opening. The second opening is aligned with the aperture of the top wall of the casing. A fan is coupled to the casing and is configured to selectively supply airflow along the inner surface. An imaging device assembly is positioned within the air channel of the supporting member and is aligned with the first opening of the chamber to view the cavity. The imaging device assembly is configured to seal the first opening. A transparent member is positioned proximate the second opening and is configured to seal the second opening.