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UL Listed Door Closer

UL Listed Door Closer, we have written about these before, but we get so many inquires about so and so number Listed Door Closer I thought it might be a good time to revisit it. The following is an explanation

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Listed door closer 236N is probably a Corbin or Russwin closer

Do you have a Listed door closer 236N?  If you do you  probably have a Corbin Russwin Door Closer.  The sticker or stamping usually says Listed Door Closer Arm 236N.  This is the UL number, which is a testing laboratory. 

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