The ornamental design for a heatproofguardrail for industrial furnaces, as shown and described.
FIG. 1 is a front perspective view of the heat proof guard rail for industrial furnaces showing its indefinite length.
FIG. 2 is a rear perspective view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a rear view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a bottom view thereof.
FIG. 7 is a right side view thereof, the left side view being a mirror image.
FIG. 8 is a perspective view depicting the article in use in an industrial furnace; and,
FIG. 9 is a section view taken along line 9—9 of FIG. 8.
The claimed design is shown broken away to indicate indeterminate length. The broken line showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design.