The exhaust fan is not sufficient in the present time as it can only pull the smoke out. The other harmful materials like carbon particles, the oil and heavy complicated gaseous molecules still remain in the kitchen air which falls in the food. These particles are very harmful for every member of the family. Therefore chimney is needed as it throws out all the harmful particles from the kitchen and keeps your family healthy years after years. There are different kinds of chimneys available as per customer''s requirement.