Abstract: A dual hinge mounting for both a rotary air screen unit of the blanking type and its associated condenser or other heat-radiating core, and by means of which the screen unit and core may be swung to accessible positions for servicing in situ. The screen unit and core are individually pivoted on separate axes and, in combination with their hinge connections and a connecting strap between them, establish an articulated parallelogram-like linkage arrangement whereby they move in unison to and from their servicing positions. A novel concealed dual latch arrangement which holds the screen unit in its operative position is accessible through a pair of hand holes in the mounting.