DESCRIPTION: This chulha is suitable for cooking food for a family of 3 to 8 persons. It is suitable for burning wood (3 to 5 cm dia and 15 to 40 cm long), dung cake and crop residues (including wheat stalk, cotton-stalk and corn cobs etc.)
MATERIALS: i) soft lateritic mud or sandy clay without any pebbles or stones. ii) Pottery lining and a tunnel made of clay. iii) Chimney pipe (7.5 cm inside dial made of asbestos cement pipe.
CONSTRUCTION: Take 6 buckets (15 litres capacity) of cleaned mud and mix 2 buckets (15 litres capacity) of wheat or paddy straw and add water. Knead the mixture to stiff consistency. Allow the mixture to stay overnight before construction of platform of the chulha. Draw the outer dimensions of the platform by appropriately locating the chimney pipe. The platform, measuring 80 x 36 x 24 cm is constructed with the clay mixture, prepared earlier. Mark the position of the pot holes, tunnels and chimney pipe on the platform. Fix mild steel grate in the first pot hole at bottom. The respective pot hole openings can be cawed out by using a knife. The tunnel adjacent to chimney pipe should be either made of pottery or asbestos cement pipe. Mark hole (12 cm dial in the roof and take out the chimney pipe. The pipe should project out of the roof between 40 to 60 cm. Allow the chulha to dry for 3 to 5 days and repair the cracks in mud before use.
PRECAUTIONS: The chimney tunnel should be cleaned every alternate day by using a brush. Fill up cracks in the body by using mud as and when they arise. Clean chimney pipe fortnightly.
SOURCE: Centre For Rural Development and Appropriate Technology, I.I.T. Hauz Khas, New Delhi - 110 016