When the mechanism is activated the trapdoor opens and the screen drops down. The motor features internal thermal overload protector, electric brake, and its gears are lifetime lubricated. Wiring compartment is completely metal lined to meet the strictest building codes. The bottom of the case is fully enclosed by two panels, mounted with full-length continuous hinge. One panel to open and close automatically as screen operates.
Second panel opens manually for access to electrical connections, limit switches and screen surface.
Hinges are mounted to allow matching of bottom panels to ceiling. Case painted with flat black primer. Included with the unit is a wall mounted electric switch for manually raising and lowering the screen. Complete with single-gang cover plate. Entire unit certified by Underwriters' Laboratories, Inc. for the U.S. and Canada.