초록 ▼

A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. A snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the ends of the section between the inner

A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. A snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the ends of the section between the inner and outer tubes and secured by screws passing through the outer tube and into the collars. The chimney can be installed by combining sections using a suitable adhesive.

대표청구항 ▼

I claim: 1. A method of manufacture of a ventilation chimney section comprising: the step of welding a plastic sheet to form an outer cylindrical tube, and the step of welding a plastic sheet to form an inner cylindrical tube, and the step of placing said inner tube within said outer tube, and the

I claim: 1. A method of manufacture of a ventilation chimney section comprising: the step of welding a plastic sheet to form an outer cylindrical tube, and the step of welding a plastic sheet to form an inner cylindrical tube, and the step of placing said inner tube within said outer tube, and the step of cutting a sheet of insulation into a plurality of segments, and the step of aligning said segments parallel to the common axis of said tubes, and the step of sliding said segments aligned parallel to said common axis between said tubes, said segments filling the space between said tubes. 2. Method of claim 1, wherein the step of cutting said sheet of insulation into segments comprises: the step of cutting said sheet into four segments, and the step of sliding said segments between said tubes, whereby each said segment forms a quarter cylindrical segment between said tubes. 3. Method of claim 2, additionally comprising: the step of inserting a collar of a male coupling element into an end of said section between said inner and outer tubes, and the step of securing said collar of said male coupling element between said tubes, and the step of inserting a collar of a female coupling element into an end of said section between said inner and outer tubes, and the step of securing said collar of said female coupling element between said tubes, said male coupling element being adapted to matingly engage a female coupling identical to said female coupling element and vice versa. 4. Method of claim 3, comprising the step of securing said collar of said male coupling element between said inner and outer tubes by fasteners, and the step of securing of said collar of said female coupling element between said inner and outer tubes by fasteners. 5. Method of claim 4, comprising the step of securing said collar of said male coupling element between said inner and outer tubes by screws, and the step of securing of said collar of said female coupling element between said inner and outer tubes by screws. 6. Method of claim 1, additionally comprising: the step of inserting a collar of a male coupling element into an end of said section between said inner and outer tubes, and the step of securing said collar of said male coupling element between said tubes, and the step of inserting a collar of a female coupling element into an end of said section between said inner and outer tubes, and the step of securing said collar of said female coupling element between said tubes, said male coupling element being adapted to matingly engage a female coupling identical to said female coupling element and vice versa. 7. Method of claim 6, comprising the step of securing said collar of said male coupling element between said inner and outer tubes by fasteners, and the step of securing of said collar of said female coupling element between said inner and outer tubes by fasteners. 8. Method of claim 7, comprising the step of securing said collar of said male coupling element between said inner and outer tubes by screws, and the step of securing of said collar of said female coupling element between said inner and outer tubes by screws. 9. Chimney ventilation section comprising coaxial inner and outer plastic tubes separated by a sheet of insulation filling the space between said inner and outer tubes, and said sheet of insulation has a plurality of segments aligned parallel to the common axis of said tubes and a collar of a male coupling element is inserted into one end of said section between said inner and outer tubes and secured therein, and a collar of a female coupling element is inserted into the other end of said section between said inner and outer tubes and secured therein, said male coupling element being adapted to matingly engage a female coupling identical to said female coupling element and vice versa, and said collars are secured between said inner and outer tubes by fasteners. 10. Section of claim 9, wherein said sheet of insulation has four quarter cylindrical segments aligned parallel to the common axis of said tubes. 11. Section of claim 10, wherein said fasteners are screws extending through said outer tube and into said collars. 12. Section of claim 10, wherein said male coupling element has a first circumferential wall abutting the collar of said male coupling element projecting outward, a first inner cylindrical sleeve at the inner edge of said first circumferential wall said first sleeve forming a plug to engage a socket of a female coupling element. 13. Section of claim 10 wherein said female coupling element has a second circumferential wall abutting said collar projecting outward, and a second outer cylindrical sleeve at the outer edge of said circumferential wall, said second sleeve and said second wall forming a socket to engage a plug of a male coupling element.