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Decade Time Line of UL Standards
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Look for the 'real' UL Mark.
Inventory snap shot.  Lots of UL Labels.

In every Decade...

There is something new in the (UL) Standards for Chimneys & Gas Vents:

1958 – UL-441 Type B Gas Vents
1965 – UL-641 Type L Vents
1971 – UL-103 1000F Pressure Stacks
1988 – UL-1777 Chimney Liners
1990 – UL-1738 Special Gas vent
1995 – UL-1978 Grease Duct
2009 – UL-2561 1400F Chimneys
2014 – Jeremias Model DWKL and SWKL all-in-one

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