Fan, fan assembly and heating and ventilation equipment

The utility model discloses a fan, a fan assembly and heating and ventilation equipment, relates to the technical field of heating and ventilation, and aims at solving the technical problem that the assembling efficiency of an existing fan on a fan cover is low. The draught fan comprises a motor and a connecting piece, the motor is provided with a motor body and a mounting frame, and the motor body is provided with a fixed end. The mounting rack is located at the fixed end and is integrally connected with the motor body. And the connecting piece is assembled at one end, far away from the motor body, of the mounting frame and is configured to be detachably connected with a fan cover of the outdoor unit. According to the draught fan, the assembling efficiency of the draught fan on the fan cover and the overall assembling efficiency of the outdoor unit are improved, and meanwhile the phenomenon of water accumulation and water seepage at the joint of the motor body and the mounting frame can be avoided.