<p>A ventilator includes a multi-wing fan deposited inside a chamber body, and a joint which connects to the outlet of the multi-wing fan. The multi-wing fan is composed of two opposite scroll board formed scroll and a volute hold by the scroll boards therebetween. A Main inlet of the multi-wing is deposited on the first scroll board. The Central axis of the joint outlet is offset towards the second scroll board. The advantage of the ventilator is that turbulence can not arise at the joint, thus it is easy to guarantee the air volume of the ventilator and reduce the noise of the ventilator. Therefore, the effective mini-type ventilating equipment is provided, and the stability of the equipment performance is also improved.</p>
