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Hot air ovens are electrical devices used in sterilization. Generally, they can be operated from 50 to 260 °C
There is a thermostat controlling the temperature. These are digitally controlled to maintain the temperature.
Their double walled insulation keeps the heat in and conserves energy, the inner layer being a poor conductor and outer layer being metallic.
There is also an air filled space in between to aid insulation.
An air circulating fan helps in uniform distribution of the heat. These are fitted with the adjustable wire mesh
plated trays or aluminum trays and may have an on/off rocker switch, as well as indicators and controls for
temperature and holding time. The capacities of these ovens vary.