A ventilation assembly, comprising: a volute, a surface of the volute being provided with a mounting port; a filter assembly arranged in the mounting port or in a portion of the volute adjacent to the mounting port, and configured to filter air; and a sealing member arranged with the mounting port or with the portion of the volute adjacent to the mounting port, and configured to seal a gap between the filter assembly and the mounting port, wherein the filter assembly comprises a bracket, a part of the bracket adjacent to the mounting port is configured to have a shape substantially the same with a shape of the mounting port to cover the mounting port; the sealing member is arranged between the bracket and the volute and has a shape substantially the same with a shape of a gap between the bracket and the mounting port, wherein an air channel communicated with the mounting port is arranged in the volute, and the ventilation assembly further comprises a fan assembly arranged in the volute and configured to drive air to flow by rotation, the bracket comprises: a mounting part having a shape substantially the same with the shape of the mounting port to cover the mounting port; and a supporting part connected with the mounting part, arranged in the air channel and configured to support a filter screen connected with the supporting part, the sealing member is arranged between the mounting part and the volute, characterized in that the fan assembly having an air output surface communicated with the air channel. a volute, a surface of the volute being provided with a mounting port; a filter assembly arranged in the mounting port or in a portion of the volute adjacent to the mounting port, and configured to filter air; and a sealing member arranged with the mounting port or with the portion of the volute adjacent to the mounting port, and configured to seal a gap between the filter assembly and the mounting port, wherein the filter assembly comprises a bracket, a part of the bracket adjacent to the mounting port is configured to have a shape substantially the same with a shape of the mounting port to cover the mounting port; the sealing member is arranged between the bracket and the volute and has a shape substantially the same with a shape of a gap between the bracket and the mounting port, wherein an air channel communicated with the mounting port is arranged in the volute, and the ventilation assembly further comprises a fan assembly arranged in the volute and configured to drive air to flow by rotation, the bracket comprises: a mounting part having a shape substantially the same with the shape of the mounting port to cover the mounting port; and a supporting part connected with the mounting part, arranged in the air channel and configured to support a filter screen connected with the supporting part, the sealing member is arranged between the mounting part and the volute, characterized in that the fan assembly having an air output surface communicated with the air channel. a mounting part having a shape substantially the same with the shape of the mounting port to cover the mounting port; and a supporting part connected with the mounting part, arranged in the air channel and configured to support a filter screen connected with the supporting part, the sealing member is arranged between the mounting part and the volute, characterized in that the fan assembly having an air output surface communicated with the air channel.