Heat treating often requires processing at high temperatures for extended periods making energy efficiency a high priority. Sensoheat ovens have thick wall insulation, heavy-duty high temperature door gaskets and air that is re-circulated through the heater box and back into the chamber for greater energy efficiency. These ovens can be used for the stress relief and ageing of metals (steel, lightweight metals) and the pre-warming of subsequent production processes. These oven can be designed for temperature range up to 500°C