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“ Are all overhead concealed closers double acting? ”

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What are Overhead Concealed door closer?
Overhead Concealed door closers are used to provide a more aesthetic look to the opening.  Concealed in either the frame or the door Offer the ability to be adjusted to maintain...
Is there a retrofit closer available for the obsolete 303 OHC closer?
The LCN direct retrofit for the Obsolete 303 OHC closer was the 330 series, it was discontinued in 2009. The 3030 closer door closer body can be used as a replacement cylinder. 
Are there any parts available for the old Dor-O-Matic 1200 overhead concealed series closers?
The Dor-O-Matic overhead concealed manual door closers have been obsolete since 1999, and there are no parts available for them.
What LCN closer is used for double acting door?
The LCN 6030 is a Double Acting (or dual action) closer. Requires a "Cased Open Frame" - that means no stops formed in the frame.
Can I use a 4040 EDA and a Glynn Johnson 100 series concealed stop together?
There is not a conflict between the 4041/4040XP EDA door closer and the GJ 100 or 410 overhead concealed series stops.  The exception is:  the 4041/4040XP mounted on a drop plate, and the Glynn Jo...
OVERHEAD CONCEALED
Concealed
How do you identify the model number and date code of an LCN cast iron hydraulic closer?
The date is a 4 digit #. The first 2 numbers indicate the week it was made, and the last 2 numbers indicate what year it was made. On most surface mounted closers, the model #,  date code, ...