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The ornamental design for an air duct filter apparatus, as shown. |
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FIG. 1 is a front plan view of the air duct filter apparatus of the present invention;
FIG. 2 is a back plan view of the air duct filter apparatus of FIG. 1;
FIG. 3 is a left side plan view of the air duct filter apparatus of FIG. 1;
FIG. 4 is a right side plan view of the air duct filter apparatus of FIG. 1;
FIG. 5 is a top plan view of the air duct filter apparatus of FIG. 1; and,
FIG. 6 is a bottom plan view of the air duct filter apparatus of FIG. 1.
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