can lcn closer be installed exterior

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Question
Answer
The LCN closers are not designed nor intended to be exterior mounted in the elements.
The 1521 is simply a re-numbered 4031 closer. They are the same unit.
All LCN closers have UL listings, and are Fire Rated for up to 3 hours.
The 1040 and 1050 are obsolete closers made in the 50's, 60's, and 70's. The 1260 or 1460 will work as replacements, but they are not direct replacement.