The ornamental design for a fanconstruction, as shown and described.
FIG. 1 is a prospective view of a fan construction, according to one embodiment of the present invention;
FIG. 2 is an elevational view of the front side of the fan construction of FIG. 1;
FIG. 3 is an elevational view of the right side of the fan construction of FIG. 1;
FIG. 4 is an elevational view of the left side of the fan construction of FIG. 1;
FIG. 5 is an elevational view of the rear side of the fan construction of FIG. 1;
FIG. 6 is a plan view of the top side of the fan construction of FIG. 1; and,
FIG. 7 is a plan view of the bottom side of the fan construction of FIG. 1.
The broken line showing of portions of a fan support and three fans is included for the purpose of illustrating environmental structure and forms no part of the claimed design.