FAN

摘要

A centrifugal fan includes an impeller including a main plate rotating about a center axis and a plurality of vanes fixed to the main plate in a circumferentially spaced-apart relationship, and a bell mouth arranged at an air intake side of the impeller to define an air inlet including a portion whose inner diameter is decreased toward the impeller. Each of the vanes preferably includes a protrusion protruding toward the bell mouth and extending into the air inlet.