The Modified Justa Stove is a version of the Justa stove. This particular version is being disseminated by Foro Para el Desarollo Sostentable Stove Dissemination Program located in San Cristobal de las Casas Chiapas. The Foro stove team refers to this stove as the Justa Mejorada which in Spanish means the "Improved Justa." This page is titled "Modified Justa" because calling this stove an "Improved Justa" may be misleading given that there have been no laboratory or field tests done on this stove. The main modification that characterizes this Modified Justa from the original Justa is in the design of the combustion chamber. The combustion chamber of the Justa has a classical rocket box shape, made of metal or tile, that has been proven in laboratories to lead to highly efficient transference of energy from the biomass fuel to the cooking surface. In comparison to this the Modified Justa has a larger combustion chamber that is built with bricks. There is no rocket box.
Examples of Modified Justa Stoves in and around San Cristobal de las Casas:
Location: Found in Chiapas State of southern Mexico
Organizations using this stove: Foro Para el Desarollo Sostentable Stove Dissemination Program
Building specifications[edit | edit source]
Materials[edit | edit source]
|bricks||6 x 12 x 24 cm||60|
|plancha||standard commercial size||1|
|chimney pipe||10 cm diameter||as many as necessary to direct smoke out of the house|
Step by step[edit | edit source]
The combustion chamber aperture dimension are extremely important for the overall functioning of the stove. Foro Para el Desarollo Sostentable Stove Dissemination Program specifies that the stove recipients can opt for aperture dimension of between 15 and 20 cm in width and between 10 and 15 cm in height. Users usually prefer the biggest opening possible in order to have the ability to fit larger pieces of wood in.
The chimney is installed either through a prefabricated whole in the back of the plancha. Many times the chimney is not inserted into a prefabricated whole in the plancha. In these cases the plancha stops at the back of the combustion chamber and the chimney chamber is covered and sealed with bricks and mortar.