C r clarke fan circulated ovens for dip coating press forming amp thermo forming c r clarke 400fd the c r clarke 400fd fan circulated oven is ideal for heating materials before dip coating dome blowing press forming and thermo forming it is also suitable for pre drying materials before vacuum formingthe oven is constructed using high quality insulation for optimum energy efficiency and is fitted with a digital temperature controller allowing it to be operated at temperatures up to 350