1 - The foil-backed is cut to size carefully on a table saw.

2 - 1” (2.5 cm) screws are used to assemble the box.

3 - A jig saw is used to cut a port in the front panel to accommodate the blower end of the heater.

4 - Multiple vent holes are added into the sides of the box. They are sealed with duct tape and can be later opened/closed to vary and control the temperature.

5 - A 1/4” hole is drilled for the thermometer, which is needed to monitor temperature. Thermometers can be purchased through a scientific equipment supply house.

6 - The glass thermometer is inserted in the drilled hole.

7 - The mold is placed in the center of the base board. The base board insulates the mold from the concrete floor. Note: DO NOT place the mold or casting directly on a wood floor, table etc. Only use the hot box on a concrete floor or slab.

8 - The hot box is lowered over the mold and base board, making sure the mold is not too close to the sides and that all sides are flush to the floor.

9 - The heater is fit into the box port. This heater produced an ambient temperature of 203°F (95°C) in 5 min.

10 - Monitor the temperature while heater is operating by viewing the thermometer.

11 - The temperature can be controlled by adding or removing duct tape.