Patent ID: 11885503
Assignee: VAN-PACKER COMPANY
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  A  E | IPC A  E  F

Claim 0:
1. A double walled grease duct comprising:
an outer shell including an outer tubular body having an outer first end and an outer second end;
an inner liner including an inner tubular body having an inner first end and an inner second end, wherein the inner liner has a cross-sectional area less than a cross-sectional area of the outer liner, wherein at least a portion of the inner liner is positioned within the outer shell; and
a spacer rigidly attaching the outer shell to the inner liner, the spacer including a planar body including an outer spacer edge and an inner spacer edge, each edge spanning between a first spacer end and a second spacer end of the planar body, wherein the outer edge contacts the outer shell, wherein the inner edge contacts the inner liner,
wherein the spacer includes a plurality of metal strips surrounding a plurality of perforations, and
wherein at least one line drawn along the planar body from the first spacer end to the second spacer end and parallel to each of the inner spacer edge and the outer spacer edge passes along lengths of metal along the plurality of metal strips and lengths of voids along the plurality of perforations, wherein a cumulative length of metal along which the at least one line passes is less than a cumulative length of voids along which the at least one line passes.