Whale air purifiers are all low-noise purifiers. Whale noise from Philo is 20db (falling leaves), 30db (turning pages) and 40db (library noise). Compared with other purifiers on the market, the noise of whales leaving the Philo is already very small, much less than that of fans. I also took a fancy to this at the beginning and bought it in their Taobao enterprise store. The name of the store is: Whale Out Life Appliances,