The 2810 series which includes the 2810, 2850 and 2860 models are all concealed operators and are the header of an opening. So, since a Hollow Metal Frame consists of two side jambs and a head frame there unfortunately would not be a way to mount the 2810 header in the opening. Best solution would be to use a surface mount 9500 Sr. Swing (9530, 9540, 9550, or 9560) on a hollow metal frame.
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