A universal convection manipulation device for insertion into a conventional oven and a method of use are provided. The universal convection manipulation device includes a substantially rectangular flexible sheet of material including an intermediate body portion. The intermediate body portion includes a first flange arranged along an end of the intermediate body portion and a second flange arranged along an opposite end of the intermediate body portion. The flexible sheet of material is capable of being flexed into an arched shape and sized to be insertable into various sized conventional ovens depending on the amount of flexure of the sheet of material. The first flange and the second flange are shaped so that they are capable of being inserted and held with a tension against a sidewall support structure of a conventional oven when the flexible sheet of material is flexed into the arched shape and released during installation within the conventional oven. The flexible sheet of material lies substantially flat in a relaxed, unflexed condition.