Fan and air conditioner indoor unit having the same

An air conditioner indoor unit, comprising:

• a housing including an air inlet and an air outlet;
• an indoor heat exchanger arranged in the housing;
• and
• a fan arranged in the housing and configured to supply air toward the air outlet, the fan including:
• a first wind wheel comprising a first hub and a plurality of first blades arranged around the first hub and spaced apart from one another, the first wind wheel having a first rotation axis;
• a second wind wheel arranged opposite to the first wind wheel, the second wind wheel comprising a second hub not directly coupled to the first hub and a plurality of second blades arranged around the second hub and spaced apart from one another, the second wind wheel having a second rotation axis;
• wherein the first blades and the second blades are tilted towards opposite directions along a circumferential direction.