No, the principle of the circulating range hood is to purify the oil fume through the filter screen and adsorber, and then blow the purified gas back to the room through the wind wheel to achieve the purpose of purifying the air. It is a specially designed range hood, which sucks the air in the kitchen by mechanical wind, filters the oil net, blocks the oil fume and exhausts the purified air. This can effectively absorb the kitchen fumes and odors. Low noise, low energy consumption, easy cleaning, etc. Therefore, the internal circulation range hood is not an IQ tax.