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5.1 Connect the door frame wiring heater firmly
5.2 Install the door frame of No. 6 and No. 7 on the side panel, lock the side panel and
the door frame by hook lock to ensure the flat top.
5.3 Install the door frame support of No. 8 at the lower part of door frame and fix the
center mullion and bottom plate of door frame firmly by M5*10 screw.