The design inspiration comes from the way coppery lamps (those painted with geese and fish) purified the lamp oil in the Han dynasty of China approximately two thousand years ago. The Ecological Range Hood turns cooking fume into clean gas through a circulative self-purifying system. The corresponding replaceable filtering solution is green, environmental friendly and degradable. The filter avoids direct contact with both the cooking fume and the machine, which helps prolong the service life of the machine and streamline the cleaning process. This type of range hood can better handle the environmental problems generated by the emission of cooking fumes. It has a vital and practical significance for countries with poor air quality, such as China.