Peephole and vents
Peepholes and vents are key elements in the design and operation of kilns that allow more precise control of the firing cycle. Peepholes are small windows or openings protected with refractory material or high temperature glass, provide a direct visual connection to the kiln interior without the need to open the door. Through them, it is possible to observe the degree of maturation of the pieces, evaluate the melting of the glazes, verify the color of the atmosphere and monitor the deformation of pyrometric cones. This real-time information is invaluable for deciding when to reach the desired temperature, when to start cooling or optimize conditions to achieve a certain aesthetic effect.
The vents, on the other hand, serve to adjust the flow of air and gases inside the kiln. Opening or closing them changes the atmosphere (oxidizing, neutral or reducing), a determining factor for the color and texture of glazes and ceramic surfaces. In traditional kilns, the management of vents is a real art, since the control of the available oxygen can trigger the appearance of unique shades, manifestations of crystallization or unusual iridescence. In modern kilns, although control can be more automated, vents are still essential to achieve special effects or to ensure a stable and efficient firing.Interesting Fact
In some cultures, such as Korean and Chinese, the kiln's peepholes and vents had a symbolic and ritual use. Controlling the fire was like a spiritual act, where looking through the peepholes allowed them to "communicate" with the fire and the materials, guiding the firing for the best results.Helpful Tip
Study the behavior of your kiln over several firings, gradually adjusting the vents and analyzing the results. Keep a notebook to record the positions of the vents, the duration of the holds, the internal atmosphere and the condition of the parts. This information will help you improve the reproducibility of your results and explore new aesthetic effects.
