Flare stack

The ornamental design for a flare stack, as shown and described.

FIG. 1 is a perspective view of a flare stack showing a new design.

FIG. 2 is a first side elevational view thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a second side elevational view thereof.

FIG. 5 is a rear elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the article that form no part of the claimed design.

Patent	Priority	Assignee	Title
D918375,	May 05 2017		Flare stack

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