An air handling apparatus, comprising: a shell provided with a hole; a filter plate connected to the shell through a first connecting member and configured to cover the hole; and a filter chamber arranged in the shell and communicated with the hole, wherein the filter chamber is configured to accommodate a filter, and a cross-sectional size of the filter is less than or equal to a cross-sectional size of the hole, characterized in that a plurality of slots are formed in the hole, and the filter is accommodatable in the slot, the air handling apparatus further comprises an air purification duct including the filter chamber, and the filter is received in the air purification duct, the air handling apparatus further comprises a filter-replacement reminding device that comprises: a first air speed sensor and a second air speed sensor that are arranged on both sides of the hole and of the filter, respectively, both the first air speed sensor and the second air speed sensor being mounted on an inner wall of the air purification duct; a single-chip microcomputer that is arranged in the shell and electrically connected with the first air speed sensor and the second air speed sensor; and an alarm that is arranged on an outer wall of the shell and electrically connected with the single-chip microcomputer, wherein the first air speed sensor and the second air speed sensor are configured to detect air speeds on both sides of the filter, respectively, and the single-chip microcomputer is configured to turn on the alarm to generate a warning sound when a difference between the air speeds on both sides of the filter exceeds an alarm value. a shell provided with a hole; a filter plate connected to the shell through a first connecting member and configured to cover the hole; and a filter chamber arranged in the shell and communicated with the hole, wherein the filter chamber is configured to accommodate a filter, and a cross-sectional size of the filter is less than or equal to a cross-sectional size of the hole, characterized in that a plurality of slots are formed in the hole, and the filter is accommodatable in the slot, the air handling apparatus further comprises an air purification duct including the filter chamber, and the filter is received in the air purification duct, the air handling apparatus further comprises a filter-replacement reminding device that comprises: a first air speed sensor and a second air speed sensor that are arranged on both sides of the hole and of the filter, respectively, both the first air speed sensor and the second air speed sensor being mounted on an inner wall of the air purification duct; a single-chip microcomputer that is arranged in the shell and electrically connected with the first air speed sensor and the second air speed sensor; and an alarm that is arranged on an outer wall of the shell and electrically connected with the single-chip microcomputer, wherein the first air speed sensor and the second air speed sensor are configured to detect air speeds on both sides of the filter, respectively, and the single-chip microcomputer is configured to turn on the alarm to generate a warning sound when a difference between the air speeds on both sides of the filter exceeds an alarm value. a first air speed sensor and a second air speed sensor that are arranged on both sides of the hole and of the filter, respectively, both the first air speed sensor and the second air speed sensor being mounted on an inner wall of the air purification duct; a single-chip microcomputer that is arranged in the shell and electrically connected with the first air speed sensor and the second air speed sensor; and an alarm that is arranged on an outer wall of the shell and electrically connected with the single-chip microcomputer, wherein the first air speed sensor and the second air speed sensor are configured to detect air speeds on both sides of the filter, respectively, and the single-chip microcomputer is configured to turn on the alarm to generate a warning sound when a difference between the air speeds on both sides of the filter exceeds an alarm value.