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Hello there! Thank you for reaching out. For the LG model LW1017ERSM1, it is generally recommended to install the outside L-bracket. The L-bracket helps secure the air conditioner unit and ensures it remains stable and properly aligned in the window. If you have any other questions or need additional support, please send us a private message on Social Media @LGUSSupport. Our team will be more than happy to assist you further. We appreciate your attention to detail! —Renzo
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