A fan and a respirator having same. The fan comprises: a first housing (1), a second housing (2), an impeller (3) and an electric motor (4), wherein the first housing (1) and the second housing (2) are fixedly connected to each other to form an eddy air path (5)； the eddy air path (5) comprises a first air inlet (501), an upper air channel (502), a lower air channel (503) and a first air outlet (504)； the impeller (3) is positioned inside the upper air channel (502), and the first air outlet (504) is positioned at the lower air channel (503)； the impeller (3) comprises an upper cover (301), a blade (302) and a lower cover (303)； and the diameter of the lower cover (303) is greater than that of the upper cover (301), the lower cover (303) serves as a separating structure between the upper air channel (502) and the lower air channel (503), and a gap is provided between the lower cover (303) and an inner wall of the first housing (1). High-speed airflow output from the impeller (3) enters the upper air channel (502) and flows along the inner wall of the first housing (1) into the lower air channel (503). Due to the fact that the gap between the lower cover (303) of the impeller (3) and the inner wall of the first housing (1) is small, intense collision and intersection of the high-speed airflow inside the upper air channel (502) and the lower air channel (503) are avoided, thus reducing aerodynamic noises.La présente invention concerne un ventilateur et un appareil respiratoire équipé de celui ci Le ventilateur comprend : un premier boîtier (1), un second boîtier (2), une roue (3) et un moteur électrique (4), le premier boîtier (1) et le second boîtier (2) étant reliés de manière fixe l'un à l'autre pour former un trajet d'air de tourbillonnement (5)； le trajet d'air de tourbillonnement (5) comprend une première entrée d'air (501), un canal d'air supérieur (502), et la première sortie d'air (504) est positionnée au niveau du canal d'air inférieur (503) ； la roue (3) es
