Prefabricated double-walled metal chimney
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United States of America Patent
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-
Jul 31, 1984
Grant Date -
N/A
app pub date -
Mar 16, 1981
filing date -
Mar 16, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A metal chimney comprised of prefabricated double-walled sections packed with compressible mineral fiber insulation material between the inner and outer metal walls. Each section has a male end and a female end constructed so that a plurality of sections can be interconnected together end-to-end and will maintain structural integrity while also reducing heat conductivity and gas leakage from the inner wall to the outer wall. The female end of each section has a flexible, diaphragm like insulation retainer and seal, while the male end utilizes a rigid spider comprised of spaced apart spoke portions between inner and outer walls in combination with an annular wafer of thin nonmetallic sheet material. After installation, the flexible diaphragm seal is compressed against the rigid spider and annular wafer allowing the insulation to form a gas seal, which is maintained even if these wafers or diaphragm seals are consumed by chimney heat.
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