Cooper IOB-R Weatherproof Horn Strobe Backbox mount the weatherproof appliances to a recessed electrical box without the need for an external weatherproof backbox. Surface-mounted appliances shall mount to Wheelock IOB weatherproof backboxes using either exposed conduit or concealed conduit. For concealed conduit the weatherproof backbox shall be mounted to a recessed electrical box with Wheelock’s WP-KIT to provide a weatherproof seal for the electrical box. Semi-flush mounted appliances shall mount to a recessed electrical box using Wheelock WFP
or WFPA flush plates to provide a weatherproof seal between the electrical box and the appliance.