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Hello! I'm your chat assistant. I've reviewed the installation instructions document for Tell door closers, models 641, 643, 644 and 645. These instructions cover regular, top jamb, and parallel arm installations, including adjustments for closing speed, latching speed, and backcheck. I'm ready to answer any questions you have about these products or the installation process.
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What is the maximum opening angle?
Are these closers suitable for both interior and exterior doors?
How do I adjust the closing speed?
How do I adjust the latching speed?
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