E - Fixed Constructions – 04 – F
Patent
E - Fixed Constructions
04
F
E04F 17/04 (2006.01) B32B 3/30 (2006.01) E04B 5/48 (2006.01) F16L 59/02 (2006.01) F16L 59/14 (2006.01) F16L 59/147 (2006.01) F24F 13/02 (2006.01)
Patent
CA 2185405
Ducts are formed from rigid or semi-rigid insulation boards by forming a plurality of longitudinally extending, spaced apart, parallel kerfs in a first major surface of each of the insulation boards which is adapted to be the interior surface of the duct. When the insulation board is formed into a duct of the preselected dimensions, the shoulders of the kerfs adjoining the interior surface of the duct abut and, preferably, the insulation material in the shoulders of the kerfs is compressed. The flexibility of the insulation boards, in the direction of the widths of the insulation boards, is controlled by increasing the depths and/or the widths of the kerfs and/or decreasing the spacing between the kerfs to make the insulation board more flexible and by decreasing the depths and/or the widths of the kerfs and/or increasing the spacing between the kerfs to make the insulation board less flexible.
Matthews Kent Russell
Schakel Eric Glenn
Macrae & Co.
Schuller International Inc.
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